20043664 has 10 divisors (see below), whose sum is σ = 38834630. Its totient is φ = 10021824.

The previous prime is 20043641. The next prime is 20043691. The reversal of 20043664 is 46634002.

It can be written as a sum of positive squares in only one way, i.e., 14379264 + 5664400 = 3792^2 + 2380^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626349 + ... + 626380.

It is an arithmetic number, because the mean of its divisors is an integer number (3883463).

Almost surely, 2^20043664 is an apocalyptic number.

It is an amenable number.

20043664 is a deficient number, since it is larger than the sum of its proper divisors (18790966).

20043664 is a wasteful number, since it uses less digits than its factorization.

20043664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252737 (or 1252731 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20043664 is about 4477.0150770351. The cubic root of 20043664 is about 271.6391552972.

Adding to 20043664 its reverse (46634002), we get a palindrome (66677666).

The spelling of 20043664 in words is "twenty million, forty-three thousand, six hundred sixty-four".