20860815657 has 16 divisors (see below), whose sum is σ = 30581932032. Its totient is φ = 12543365520.

The previous prime is 20860815631. The next prime is 20860815667. The reversal of 20860815657 is 75651806802.

It is not a de Polignac number, because 20860815657 - 2⁶ = 20860815593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20860815667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2484573 + ... + 2492954.

It is an arithmetic number, because the mean of its divisors is an integer number (1911370752).

Almost surely, 2^20860815657 is an apocalyptic number.

It is an amenable number.

20860815657 is a deficient number, since it is larger than the sum of its proper divisors (9721116375).

20860815657 is a wasteful number, since it uses less digits than its factorization.

20860815657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4977668.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 20860815657 in words is "twenty billion, eight hundred sixty million, eight hundred fifteen thousand, six hundred fifty-seven".