20172771522 has 30 divisors (see below), whose sum is σ = 45206002083. Its totient is φ = 6723654588.

The previous prime is 20172771467. The next prime is 20172771533. The reversal of 20172771522 is 22517727102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10086385761 + 10086385761 = 100431^2 + 100431^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=100431.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1802179 + ... + 1813337.

Almost surely, 2^20172771522 is an apocalyptic number.

20172771522 is an abundant number, since it is smaller than the sum of its proper divisors (25033230561).

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

20172771522 is an frugal number, since it uses more digits than its factorization.

20172771522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22332 (or 11164 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

It can be divided in two parts, 2017277152 and 2, that multiplied together give a palindrome (4034554304).

The spelling of 20172771522 in words is "twenty billion, one hundred seventy-two million, seven hundred seventy-one thousand, five hundred twenty-two".