20156710659 has 16 divisors (see below), whose sum is σ = 27752947200. Its totient is φ = 13004875296.

The previous prime is 20156710657. The next prime is 20156710667. The reversal of 20156710659 is 95601765102.

It is not a de Polignac number, because 20156710659 - 2¹ = 20156710657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20156710659.

It is not an unprimeable number, because it can be changed into a prime (20156710657) 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, 702699 + ... + 730820.

It is an arithmetic number, because the mean of its divisors is an integer number (1734559200).

Almost surely, 2^20156710659 is an apocalyptic number.

20156710659 is a deficient number, since it is larger than the sum of its proper divisors (7596236541).

20156710659 is a wasteful number, since it uses less digits than its factorization.

20156710659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433674.

The product of its (nonzero) digits is 113400, while the sum is 42.

It can be divided in two parts, 201567 and 10659, that added together give a triangular number (212226 = T₆₅₁).

The spelling of 20156710659 in words is "twenty billion, one hundred fifty-six million, seven hundred ten thousand, six hundred fifty-nine".