Base | Representation |
---|---|
bin | 10100001001011111… |
… | …111100000101110100 |
3 | 2001211201120102201120 |
4 | 110021133330011310 |
5 | 323301324012040 |
6 | 13534424023540 |
7 | 1364054462052 |
oct | 241137740564 |
9 | 61751512646 |
10 | 21634204020 |
11 | 91a1a42760 |
12 | 4239301bb0 |
13 | 206a128070 |
14 | 10933611d2 |
15 | 8694747d0 |
hex | 5097fc174 |
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".
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