22715521720 has 64 divisors (see below), whose sum is σ = 54415670400. Its totient is φ = 8504432640.

The previous prime is 22715521693. The next prime is 22715521723. The reversal of 22715521720 is 2712551722.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22715521723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30801 + ... + 215359.

It is an arithmetic number, because the mean of its divisors is an integer number (850244850).

Almost surely, 2^22715521720 is an apocalyptic number.

22715521720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22715521720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27207835200).

22715521720 is an abundant number, since it is smaller than the sum of its proper divisors (31700148680).

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

22715521720 is a wasteful number, since it uses less digits than its factorization.

22715521720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184768 (or 184764 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

The spelling of 22715521720 in words is "twenty-two billion, seven hundred fifteen million, five hundred twenty-one thousand, seven hundred twenty".