20436495657 has 16 divisors (see below), whose sum is σ = 27662205312. Its totient is φ = 13417971840.

The previous prime is 20436495613. The next prime is 20436495733. The reversal of 20436495657 is 75659463402.

It is not a de Polignac number, because 20436495657 - 2⁶ = 20436495593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20436495557) 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, 148383 + ... + 250779.

It is an arithmetic number, because the mean of its divisors is an integer number (1728887832).

Almost surely, 2^20436495657 is an apocalyptic number.

It is an amenable number.

20436495657 is a deficient number, since it is larger than the sum of its proper divisors (7225709655).

20436495657 is a wasteful number, since it uses less digits than its factorization.

20436495657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103408.

The product of its (nonzero) digits is 5443200, while the sum is 51.

The spelling of 20436495657 in words is "twenty billion, four hundred thirty-six million, four hundred ninety-five thousand, six hundred fifty-seven".