15724731220 has 48 divisors (see below), whose sum is σ = 36286947648. Its totient is φ = 5676335360.

The previous prime is 15724731199. The next prime is 15724731251. The reversal of 15724731220 is 2213742751.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230722 + ... + 291001.

It is an arithmetic number, because the mean of its divisors is an integer number (755978076).

Almost surely, 2^15724731220 is an apocalyptic number.

15724731220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15724731220 is an abundant number, since it is smaller than the sum of its proper divisors (20562216428).

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

15724731220 is a wasteful number, since it uses less digits than its factorization.

15724731220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521880 (or 521878 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 15724731220 in words is "fifteen billion, seven hundred twenty-four million, seven hundred thirty-one thousand, two hundred twenty".