20988504 has 32 divisors (see below), whose sum is σ = 58302000. Its totient is φ = 6996096.

The previous prime is 20988497. The next prime is 20988551. The reversal of 20988504 is 40588902.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48369 + ... + 48800.

Almost surely, 2^20988504 is an apocalyptic number.

20988504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20988504 is an abundant number, since it is smaller than the sum of its proper divisors (37313496).

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

20988504 is a wasteful number, since it uses less digits than its factorization.

20988504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97184 (or 97174 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 20988504 is about 4581.3212068136. The cubic root of 20988504 is about 275.8420646514.

The spelling of 20988504 in words is "twenty million, nine hundred eighty-eight thousand, five hundred four".