20013721565742 has 24 divisors (see below), whose sum is σ = 45645329887560. Its totient is φ = 6320122599600.

The previous prime is 20013721565701. The next prime is 20013721565777. The reversal of 20013721565742 is 24756512731002.

20013721565742 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 3 + 7 + 21 + 56 + 574 + 2 = 666.

It is a super-2 number, since 2×20013721565742² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29259826509 + ... + 29259827192.

It is an arithmetic number, because the mean of its divisors is an integer number (1901888745315).

Almost surely, 2^{20013721565742} is an apocalyptic number.

20013721565742 is an abundant number, since it is smaller than the sum of its proper divisors (25631608321818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20013721565742 is a wasteful number, since it uses less digits than its factorization.

20013721565742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58519653728 (or 58519653725 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The spelling of 20013721565742 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, five hundred sixty-five thousand, seven hundred forty-two".