20023564644451 has 32 divisors (see below), whose sum is σ = 21143922528960. Its totient is φ = 18938108012544.

The previous prime is 20023564644403. The next prime is 20023564644547. The reversal of 20023564644451 is 15444646532002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023564644451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20023561644451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 959294151 + ... + 959315023.

It is an arithmetic number, because the mean of its divisors is an integer number (660747579030).

Almost surely, 2^{20023564644451} is an apocalyptic number.

20023564644451 is a deficient number, since it is larger than the sum of its proper divisors (1120357884509).

20023564644451 is a wasteful number, since it uses less digits than its factorization.

20023564644451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23815.

The product of its (nonzero) digits is 2764800, while the sum is 46.

The spelling of 20023564644451 in words is "twenty trillion, twenty-three billion, five hundred sixty-four million, six hundred forty-four thousand, four hundred fifty-one".