20979504 has 120 divisors (see below), whose sum is σ = 72307872. Its totient is φ = 5529600.

The previous prime is 20979493. The next prime is 20979521. The reversal of 20979504 is 40597902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12304 + ... + 13904.

Almost surely, 2^20979504 is an apocalyptic number.

20979504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20979504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36153936).

20979504 is an abundant number, since it is smaller than the sum of its proper divisors (51328368).

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

20979504 is a wasteful number, since it uses less digits than its factorization.

20979504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 20979504 is about 4580.3388520938. The cubic root of 20979504 is about 275.8026314215.

The spelling of 20979504 in words is "twenty million, nine hundred seventy-nine thousand, five hundred four".