20157777522 has 12 divisors (see below), whose sum is σ = 43675184670. Its totient is φ = 6719259168.

The previous prime is 20157777481. The next prime is 20157777571. The reversal of 20157777522 is 22577775102.

20157777522 is a `hidden beast` number, since 2 + 0 + 1 + 57 + 7 + 77 + 522 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20107523601 + 50253921 = 141801^2 + 7089^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 559938247 + ... + 559938282.

Almost surely, 2^20157777522 is an apocalyptic number.

20157777522 is an abundant number, since it is smaller than the sum of its proper divisors (23517407148).

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

20157777522 is a wasteful number, since it uses less digits than its factorization.

20157777522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119876537 (or 1119876534 counting only the distinct ones).

The product of its (nonzero) digits is 480200, while the sum is 45.

The spelling of 20157777522 in words is "twenty billion, one hundred fifty-seven million, seven hundred seventy-seven thousand, five hundred twenty-two".