20936499172 has 6 divisors (see below), whose sum is σ = 36638873558. Its totient is φ = 10468249584.

The previous prime is 20936499169. The next prime is 20936499193. The reversal of 20936499172 is 27199463902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14610523876 + 6325975296 = 120874^2 + 79536^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2617062393 + ... + 2617062400.

Almost surely, 2^20936499172 is an apocalyptic number.

It is an amenable number.

20936499172 is a deficient number, since it is larger than the sum of its proper divisors (15702374386).

20936499172 is a wasteful number, since it uses less digits than its factorization.

20936499172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5234124797 (or 5234124795 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 20936499172 in words is "twenty billion, nine hundred thirty-six million, four hundred ninety-nine thousand, one hundred seventy-two".