20624520 has 128 divisors (see below), whose sum is σ = 72483840. Its totient is φ = 4596480.

The previous prime is 20624497. The next prime is 20624531. The reversal of 20624520 is 2542602.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35835 + ... + 36405.

It is an arithmetic number, because the mean of its divisors is an integer number (566280).

Almost surely, 2^20624520 is an apocalyptic number.

20624520 is a gapful number since it is divisible by the number (20) 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 20624520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36241920).

20624520 is an abundant number, since it is smaller than the sum of its proper divisors (51859320).

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

20624520 is a wasteful number, since it uses less digits than its factorization.

20624520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20624520 is about 4541.4226845780. The cubic root of 20624520 is about 274.2382001650.

The spelling of 20624520 in words is "twenty million, six hundred twenty-four thousand, five hundred twenty".