20631604 has 12 divisors (see below), whose sum is σ = 41263264. Its totient is φ = 8842104.

The previous prime is 20631601. The next prime is 20631617. The reversal of 20631604 is 40613602.

20631604 is an admirable number.

It is a super-2 number, since 2×20631604² = 851326167225632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 368394 + ... + 368449.

Almost surely, 2^20631604 is an apocalyptic number.

It is an amenable number.

20631604 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20631604 is a wasteful number, since it uses less digits than its factorization.

20631604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736854 (or 736852 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20631604 is about 4542.2025494247. The cubic root of 20631604 is about 274.2695945284.

The spelling of 20631604 in words is "twenty million, six hundred thirty-one thousand, six hundred four".