20257776172 has 6 divisors (see below), whose sum is σ = 35451108308. Its totient is φ = 10128888084.

The previous prime is 20257776169. The next prime is 20257776173. The reversal of 20257776172 is 27167775202.

It is not an unprimeable number, because it can be changed into a prime (20257776173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2532222018 + ... + 2532222025.

Almost surely, 2^20257776172 is an apocalyptic number.

It is an amenable number.

20257776172 is a deficient number, since it is larger than the sum of its proper divisors (15193332136).

20257776172 is a wasteful number, since it uses less digits than its factorization.

20257776172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5064444047 (or 5064444045 counting only the distinct ones).

The product of its (nonzero) digits is 576240, while the sum is 46.

The spelling of 20257776172 in words is "twenty billion, two hundred fifty-seven million, seven hundred seventy-six thousand, one hundred seventy-two".