20624404 has 6 divisors (see below), whose sum is σ = 36092714. Its totient is φ = 10312200.

The previous prime is 20624381. The next prime is 20624447. The reversal of 20624404 is 40442602.

It can be written as a sum of positive squares in only one way, i.e., 10575504 + 10048900 = 3252^2 + 3170^2 .

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 as a sum of consecutive naturals, namely, 2578047 + ... + 2578054.

Almost surely, 2^20624404 is an apocalyptic number.

It is an amenable number.

20624404 is a deficient number, since it is larger than the sum of its proper divisors (15468310).

20624404 is a wasteful number, since it uses less digits than its factorization.

20624404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156105 (or 5156103 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 20624404 is about 4541.4099132318. The cubic root of 20624404 is about 274.2376860247.

The spelling of 20624404 in words is "twenty million, six hundred twenty-four thousand, four hundred four".