20857622616 has 48 divisors (see below), whose sum is σ = 58311639360. Its totient is φ = 6728264640.

The previous prime is 20857622567. The next prime is 20857622627. The reversal of 20857622616 is 61622675802.

20857622616 is a `hidden beast` number, since 2 + 0 + 8 + 5 + 7 + 6 + 22 + 616 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4670175 + ... + 4674638.

It is an arithmetic number, because the mean of its divisors is an integer number (1214825820).

Almost surely, 2^20857622616 is an apocalyptic number.

It is an amenable number.

20857622616 is an abundant number, since it is smaller than the sum of its proper divisors (37454016744).

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

20857622616 is a wasteful number, since it uses less digits than its factorization.

20857622616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9344856 (or 9344849 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 20857622616 in words is "twenty billion, eight hundred fifty-seven million, six hundred twenty-two thousand, six hundred sixteen".