20924812513 has 16 divisors (see below), whose sum is σ = 23056830720. Its totient is φ = 18831398400.

The previous prime is 20924812507. The next prime is 20924812541. The reversal of 20924812513 is 31521842902.

It is a cyclic number.

It is not a de Polignac number, because 20924812513 - 2²¹ = 20922715361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20924812583) 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, 1468881 + ... + 1483057.

It is an arithmetic number, because the mean of its divisors is an integer number (1441051920).

Almost surely, 2^20924812513 is an apocalyptic number.

It is an amenable number.

20924812513 is a deficient number, since it is larger than the sum of its proper divisors (2132018207).

20924812513 is a wasteful number, since it uses less digits than its factorization.

20924812513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15528.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 20924812513 in words is "twenty billion, nine hundred twenty-four million, eight hundred twelve thousand, five hundred thirteen".