20857680570 has 64 divisors (see below), whose sum is σ = 50366914560. Its totient is φ = 5527867968.

The previous prime is 20857680563. The next prime is 20857680583. The reversal of 20857680570 is 7508675802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4034127 + ... + 4039293.

It is an arithmetic number, because the mean of its divisors is an integer number (786983040).

Almost surely, 2^20857680570 is an apocalyptic number.

20857680570 is an abundant number, since it is smaller than the sum of its proper divisors (29509233990).

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

20857680570 is a wasteful number, since it uses less digits than its factorization.

20857680570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5979.

The product of its (nonzero) digits is 940800, while the sum is 48.

The spelling of 20857680570 in words is "twenty billion, eight hundred fifty-seven million, six hundred eighty thousand, five hundred seventy".