20845904 has 10 divisors (see below), whose sum is σ = 40388970. Its totient is φ = 10422944.

The previous prime is 20845897. The next prime is 20845921. The reversal of 20845904 is 40954802.

It can be written as a sum of positive squares in only one way, i.e., 11235904 + 9610000 = 3352^2 + 3100^2 .

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, 651419 + ... + 651450.

It is an arithmetic number, because the mean of its divisors is an integer number (4038897).

Almost surely, 2^20845904 is an apocalyptic number.

It is an amenable number.

20845904 is a deficient number, since it is larger than the sum of its proper divisors (19543066).

20845904 is a wasteful number, since it uses less digits than its factorization.

20845904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302877 (or 1302871 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20845904 is about 4565.7314857534. The cubic root of 20845904 is about 275.2159361828.

The spelling of 20845904 in words is "twenty million, eight hundred forty-five thousand, nine hundred four".