20977379584 has 72 divisors (see below), whose sum is σ = 49398476288. Its totient is φ = 8700272640.

The previous prime is 20977379569. The next prime is 20977379587. The reversal of 20977379584 is 48597377902.

It is a super-2 number, since 2×20977379584² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20977379587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133257 + ... + 244360.

Almost surely, 2^20977379584 is an apocalyptic number.

It is an amenable number.

20977379584 is an abundant number, since it is smaller than the sum of its proper divisors (28421096704).

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

20977379584 is an equidigital number, since it uses as much as digits as its factorization.

20977379584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377671 (or 377657 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 61.

The spelling of 20977379584 in words is "twenty billion, nine hundred seventy-seven million, three hundred seventy-nine thousand, five hundred eighty-four".