20664654 has 16 divisors (see below), whose sum is σ = 41594448. Its totient is φ = 6844032.

The previous prime is 20664653. The next prime is 20664659. The reversal of 20664654 is 45646602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664653) by changing a digit.

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, 10027 + ... + 11910.

It is an arithmetic number, because the mean of its divisors is an integer number (2599653).

Almost surely, 2^20664654 is an apocalyptic number.

20664654 is an abundant number, since it is smaller than the sum of its proper divisors (20929794).

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

20664654 is a wasteful number, since it uses less digits than its factorization.

20664654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22099.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 20664654 is about 4545.8391964521. The cubic root of 20664654 is about 274.4159682531.

The spelling of 20664654 in words is "twenty million, six hundred sixty-four thousand, six hundred fifty-four".