20955664 has 20 divisors (see below), whose sum is σ = 40672620. Its totient is φ = 10459520.

The previous prime is 20955647. The next prime is 20955667. The reversal of 20955664 is 46655902.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 12194064 = 2960^2 + 3492^2 .

It is not an unprimeable number, because it can be changed into a prime (20955667) 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, 17154 + ... + 18334.

It is an arithmetic number, because the mean of its divisors is an integer number (2033631).

Almost surely, 2^20955664 is an apocalyptic number.

It is an amenable number.

20955664 is a deficient number, since it is larger than the sum of its proper divisors (19716956).

20955664 is a wasteful number, since it uses less digits than its factorization.

20955664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298 (or 2292 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 20955664 is about 4577.7356848119. The cubic root of 20955664 is about 275.6981226455.

The spelling of 20955664 in words is "twenty million, nine hundred fifty-five thousand, six hundred sixty-four".