20955972560 has 20 divisors (see below), whose sum is σ = 48722636388. Its totient is φ = 8382388992.

The previous prime is 20955972517. The next prime is 20955972571. The reversal of 20955972560 is 6527955902.

It can be written as a sum of positive squares in 2 ways, for example, as 8075538496 + 12880434064 = 89864^2 + 113492^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 20955972499 and 20955972508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130974749 + ... + 130974908.

Almost surely, 2^20955972560 is an apocalyptic number.

20955972560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20955972560 is an abundant number, since it is smaller than the sum of its proper divisors (27766663828).

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

20955972560 is a wasteful number, since it uses less digits than its factorization.

20955972560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261949670 (or 261949664 counting only the distinct ones).

The product of its (nonzero) digits is 1701000, while the sum is 50.

The spelling of 20955972560 in words is "twenty billion, nine hundred fifty-five million, nine hundred seventy-two thousand, five hundred sixty".