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21634204020 = 223511132521469
BaseRepresentation
bin10100001001011111…
…111100000101110100
32001211201120102201120
4110021133330011310
5323301324012040
613534424023540
71364054462052
oct241137740564
961751512646
1021634204020
1191a1a42760
124239301bb0
13206a128070
1410933611d2
158694747d0
hex5097fc174

21634204020 has 96 divisors (see below), whose sum is σ = 71165969280. Its totient is φ = 4841218560.

The previous prime is 21634203977. The next prime is 21634204021. The reversal of 21634204020 is 2040243612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634204021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1252155 + ... + 1269314.

It is an arithmetic number, because the mean of its divisors is an integer number (741312180).

Almost surely, 221634204020 is an apocalyptic number.

21634204020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21634204020 is an abundant number, since it is smaller than the sum of its proper divisors (49531765260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21634204020 is a wasteful number, since it uses less digits than its factorization.

21634204020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2521505 (or 2521503 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21634204020 its reverse (2040243612), we get a palindrome (23674447632).

The spelling of 21634204020 in words is "twenty-one billion, six hundred thirty-four million, two hundred four thousand, twenty".

Divisors: 1 2 3 4 5 6 10 11 12 13 15 20 22 26 30 33 39 44 52 55 60 65 66 78 110 130 132 143 156 165 195 220 260 286 330 390 429 572 660 715 780 858 1430 1716 2145 2860 4290 8580 2521469 5042938 7564407 10085876 12607345 15128814 25214690 27736159 30257628 32779097 37822035 50429380 55472318 65558194 75644070 83208477 98337291 110944636 131116388 138680795 151288140 163895485 166416954 196674582 277361590 327790970 332833908 360570067 393349164 416042385 491686455 554723180 655581940 721140134 832084770 983372910 1081710201 1442280268 1664169540 1802850335 1966745820 2163420402 3605700670 4326840804 5408551005 7211401340 10817102010 21634204020