20664610 has 8 divisors (see below), whose sum is σ = 37196316. Its totient is φ = 8265840.

The previous prime is 20664601. The next prime is 20664641. The reversal of 20664610 is 1646602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20133169 + 531441 = 4487^2 + 729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20664610² = 854052212904200, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 1033221 + ... + 1033240.

Almost surely, 2^20664610 is an apocalyptic number.

20664610 is a deficient number, since it is larger than the sum of its proper divisors (16531706).

20664610 is a wasteful number, since it uses less digits than its factorization.

20664610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066468.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20664610 is about 4545.8343568590. The cubic root of 20664610 is about 274.4157734872.

The spelling of 20664610 in words is "twenty million, six hundred sixty-four thousand, six hundred ten".