20902354722 has 90 divisors (see below), whose sum is σ = 48294136737. Its totient is φ = 6757060176.

The previous prime is 20902354699. The next prime is 20902354729. The reversal of 20902354722 is 22745320902.

20902354722 is a `hidden beast` number, since 2 + 0 + 90 + 2 + 3 + 547 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16863879321 + 4038475401 = 129861^2 + 63549^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=102231.

It is not an unprimeable number, because it can be changed into a prime (20902354729) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 68085693 + ... + 68085999.

Almost surely, 2^20902354722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20902354722

20902354722 is an abundant number, since it is smaller than the sum of its proper divisors (27391782015).

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

20902354722 is an frugal number, since it uses more digits than its factorization.

20902354722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 20902354722 in words is "twenty billion, nine hundred two million, three hundred fifty-four thousand, seven hundred twenty-two".