20724084731 has 12 divisors (see below), whose sum is σ = 24199337328. Its totient is φ = 17385541392.

The previous prime is 20724084727. The next prime is 20724084743. The reversal of 20724084731 is 13748042702.

It is not a de Polignac number, because 20724084731 - 2² = 20724084727 is a prime.

It is a super-2 number, since 2×20724084731² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20724084791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 654656 + ... + 685581.

It is an arithmetic number, because the mean of its divisors is an integer number (2016611444).

Almost surely, 2^20724084731 is an apocalyptic number.

20724084731 is a deficient number, since it is larger than the sum of its proper divisors (3475252597).

20724084731 is an equidigital number, since it uses as much as digits as its factorization.

20724084731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340338 (or 1340291 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The spelling of 20724084731 in words is "twenty billion, seven hundred twenty-four million, eighty-four thousand, seven hundred thirty-one".