20372542665 has 16 divisors (see below), whose sum is σ = 32900707008. Its totient is φ = 10763809856.

The previous prime is 20372542639. The next prime is 20372542669. The reversal of 20372542665 is 56624527302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20372542665 - 2¹² = 20372538569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20372542669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6344982 + ... + 6348191.

It is an arithmetic number, because the mean of its divisors is an integer number (2056294188).

Almost surely, 2^20372542665 is an apocalyptic number.

It is an amenable number.

20372542665 is a deficient number, since it is larger than the sum of its proper divisors (12528164343).

20372542665 is a wasteful number, since it uses less digits than its factorization.

20372542665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12693288.

The product of its (nonzero) digits is 604800, while the sum is 42.

The spelling of 20372542665 in words is "twenty billion, three hundred seventy-two million, five hundred forty-two thousand, six hundred sixty-five".