20466664 has 8 divisors (see below), whose sum is σ = 38375010. Its totient is φ = 10233328.

The previous prime is 20466653. The next prime is 20466671. The reversal of 20466664 is 46666402.

It can be written as a sum of positive squares in only one way, i.e., 19873764 + 592900 = 4458^2 + 770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1279159 + ... + 1279174.

Almost surely, 2^20466664 is an apocalyptic number.

It is an amenable number.

20466664 is a deficient number, since it is larger than the sum of its proper divisors (17908346).

20466664 is a wasteful number, since it uses less digits than its factorization.

20466664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558339 (or 2558335 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 20466664 is about 4524.0097258958. The cubic root of 20466664 is about 273.5367525338.

The spelling of 20466664 in words is "twenty million, four hundred sixty-six thousand, six hundred sixty-four".