20856725552 has 40 divisors (see below), whose sum is σ = 43558722480. Its totient is φ = 9617253120.

The previous prime is 20856725503. The next prime is 20856725563. The reversal of 20856725552 is 25552765802.

It is a junction number, because it is equal to n+sod(n) for n = 20856725497 and 20856725506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180974 + ... + 272882.

It is an arithmetic number, because the mean of its divisors is an integer number (1088968062).

Almost surely, 2^20856725552 is an apocalyptic number.

It is an amenable number.

20856725552 is an abundant number, since it is smaller than the sum of its proper divisors (22701996928).

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

20856725552 is a wasteful number, since it uses less digits than its factorization.

20856725552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93021 (or 93015 counting only the distinct ones).

The product of its (nonzero) digits is 1680000, while the sum is 47.

The spelling of 20856725552 in words is "twenty billion, eight hundred fifty-six million, seven hundred twenty-five thousand, five hundred fifty-two".