20664634 has 8 divisors (see below), whose sum is σ = 31033440. Its totient is φ = 10320156.

The previous prime is 20664601. The next prime is 20664641. The reversal of 20664634 is 43646602.

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

It is a junction number, because it is equal to n+sod(n) for n = 20664596 and 20664605.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3784 + ... + 7459.

It is an arithmetic number, because the mean of its divisors is an integer number (3879180).

Almost surely, 2^20664634 is an apocalyptic number.

20664634 is a deficient number, since it is larger than the sum of its proper divisors (10368806).

20664634 is a wasteful number, since it uses less digits than its factorization.

20664634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12164.

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 20664634 is about 4545.8369966377. The cubic root of 20664634 is about 274.4158797231.

The spelling of 20664634 in words is "twenty million, six hundred sixty-four thousand, six hundred thirty-four".