20979829584 has 60 divisors (see below), whose sum is σ = 67102156576. Its totient is φ = 5994236736.

The previous prime is 20979829553. The next prime is 20979829649. The reversal of 20979829584 is 48592897902.

It is a happy number.

20979829584 is a `hidden beast` number, since 20 + 9 + 7 + 9 + 8 + 29 + 584 = 666.

It is a super-2 number, since 2×20979829584² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10405654 + ... + 10407669.

Almost surely, 2^20979829584 is an apocalyptic number.

20979829584 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20979829584 is an abundant number, since it is smaller than the sum of its proper divisors (46122326992).

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

20979829584 is a wasteful number, since it uses less digits than its factorization.

20979829584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20813344 (or 20813335 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 20979829584 in words is "twenty billion, nine hundred seventy-nine million, eight hundred twenty-nine thousand, five hundred eighty-four".