20164624 has 40 divisors (see below), whose sum is σ = 41559840. Its totient is φ = 9451008.

The previous prime is 20164621. The next prime is 20164631. The reversal of 20164624 is 42646102.

It is a super-2 number, since 2×20164624² = 813224122122752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20164621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34059 + ... + 34645.

It is an arithmetic number, because the mean of its divisors is an integer number (1038996).

Almost surely, 2^20164624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20164624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20779920).

20164624 is an abundant number, since it is smaller than the sum of its proper divisors (21395216).

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

20164624 is a wasteful number, since it uses less digits than its factorization.

20164624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20164624 is about 4490.5037579318. The cubic root of 20164624 is about 272.1844913291.

The spelling of 20164624 in words is "twenty million, one hundred sixty-four thousand, six hundred twenty-four".