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20102105556 = 22331314317739
BaseRepresentation
bin10010101110001011…
…011100100111010100
31220212221122202202000
4102232023130213110
5312132114334211
613122413515300
71311102035511
oct225613344724
956787582660
1020102105556
118586129485
123a901a2b30
131b848a7920
14d89aa4308
157c9bd9656
hex4ae2dc9d4

20102105556 has 48 divisors (see below), whose sum is σ = 56125540800. Its totient is φ = 6185262816.

The previous prime is 20102105509. The next prime is 20102105591. The reversal of 20102105556 is 65550120102.

20102105556 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 2 + 105 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7157466 + ... + 7160273.

It is an arithmetic number, because the mean of its divisors is an integer number (1169282100).

Almost surely, 220102105556 is an apocalyptic number.

20102105556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20102105556 is an abundant number, since it is smaller than the sum of its proper divisors (36023435244).

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

20102105556 is a wasteful number, since it uses less digits than its factorization.

20102105556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14317765 (or 14317757 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 20102105556 its reverse (65550120102), we get a palindrome (85652225658).

The spelling of 20102105556 in words is "twenty billion, one hundred two million, one hundred five thousand, five hundred fifty-six".

Divisors: 1 2 3 4 6 9 12 13 18 26 27 36 39 52 54 78 108 117 156 234 351 468 702 1404 14317739 28635478 42953217 57270956 85906434 128859651 171812868 186130607 257719302 372261214 386578953 515438604 558391821 744522428 773157906 1116783642 1546315812 1675175463 2233567284 3350350926 5025526389 6700701852 10051052778 20102105556