20977397974 has 64 divisors (see below), whose sum is σ = 35438247936. Its totient is φ = 9249738624.

The previous prime is 20977397971. The next prime is 20977397977. The reversal of 20977397974 is 47979377902.

It is an interprime number because it is at equal distance from previous prime (20977397971) and next prime (20977397977).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20977397971) 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 in 31 ways as a sum of consecutive naturals, for example, 12583089 + ... + 12584755.

It is an arithmetic number, because the mean of its divisors is an integer number (553722624).

Almost surely, 2^20977397974 is an apocalyptic number.

20977397974 is a deficient number, since it is larger than the sum of its proper divisors (14460849962).

20977397974 is a wasteful number, since it uses less digits than its factorization.

20977397974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949.

The product of its (nonzero) digits is 42007896, while the sum is 64.

The spelling of 20977397974 in words is "twenty billion, nine hundred seventy-seven million, three hundred ninety-seven thousand, nine hundred seventy-four".