20931396177 has 8 divisors (see below), whose sum is σ = 27910128960. Its totient is φ = 13953463760.

The previous prime is 20931396163. The next prime is 20931396179. The reversal of 20931396177 is 77169313902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20931396177 - 2⁸ = 20931395921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20931396179) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 136149 + ... + 245762.

It is an arithmetic number, because the mean of its divisors is an integer number (3488766120).

Almost surely, 2^20931396177 is an apocalyptic number.

It is an amenable number.

20931396177 is a deficient number, since it is larger than the sum of its proper divisors (6978732783).

20931396177 is a wasteful number, since it uses less digits than its factorization.

20931396177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400183.

The product of its (nonzero) digits is 428652, while the sum is 48.

The spelling of 20931396177 in words is "twenty billion, nine hundred thirty-one million, three hundred ninety-six thousand, one hundred seventy-seven".