20961304 has 32 divisors (see below), whose sum is σ = 48373920. Its totient is φ = 8292096.

The previous prime is 20961299. The next prime is 20961319. The reversal of 20961304 is 40316902.

It is a congruent number.

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, 13669 + ... + 15124.

It is an arithmetic number, because the mean of its divisors is an integer number (1511685).

Almost surely, 2^20961304 is an apocalyptic number.

It is an amenable number.

20961304 is an abundant number, since it is smaller than the sum of its proper divisors (27412616).

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

20961304 is a wasteful number, since it uses less digits than its factorization.

20961304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28819 (or 28815 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20961304 is about 4578.3516684501. The cubic root of 20961304 is about 275.7228541919.

The spelling of 20961304 in words is "twenty million, nine hundred sixty-one thousand, three hundred four".