20906304 has 28 divisors (see below), whose sum is σ = 55315104. Its totient is φ = 6968704.

The previous prime is 20906297. The next prime is 20906317. The reversal of 20906304 is 40360902.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54252 + ... + 54635.

Almost surely, 2^20906304 is an apocalyptic number.

20906304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20906304 is an abundant number, since it is smaller than the sum of its proper divisors (34408800).

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

20906304 is a wasteful number, since it uses less digits than its factorization.

20906304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108902 (or 108892 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20906304 is about 4572.3411946179. The cubic root of 20906304 is about 275.4814881671.

The spelling of 20906304 in words is "twenty million, nine hundred six thousand, three hundred four".