20724860328 has 64 divisors (see below), whose sum is σ = 53292296640. Its totient is φ = 6712602624.

The previous prime is 20724860279. The next prime is 20724860399. The reversal of 20724860328 is 82306842702.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20724860328.

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, 147150 + ... + 251202.

It is an arithmetic number, because the mean of its divisors is an integer number (832692135).

Almost surely, 2^20724860328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20724860328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26646148320).

20724860328 is an abundant number, since it is smaller than the sum of its proper divisors (32567436312).

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

20724860328 is a wasteful number, since it uses less digits than its factorization.

20724860328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104298 (or 104294 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 42.

The spelling of 20724860328 in words is "twenty billion, seven hundred twenty-four million, eight hundred sixty thousand, three hundred twenty-eight".