20624172 has 24 divisors (see below), whose sum is σ = 48705216. Its totient is φ = 6791568.

The previous prime is 20624159. The next prime is 20624183. The reversal of 20624172 is 27142602.

It is an unprimeable number.

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, 9358 + ... + 11349.

It is an arithmetic number, because the mean of its divisors is an integer number (2029384).

Almost surely, 2^20624172 is an apocalyptic number.

It is an amenable number.

20624172 is an abundant number, since it is smaller than the sum of its proper divisors (28081044).

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

20624172 is a wasteful number, since it uses less digits than its factorization.

20624172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20797 (or 20795 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20624172 is about 4541.3843704316. The cubic root of 20624172 is about 274.2366577383.

Adding to 20624172 its reverse (27142602), we get a palindrome (47766774).

The spelling of 20624172 in words is "twenty million, six hundred twenty-four thousand, one hundred seventy-two".