20339664 has 40 divisors (see below), whose sum is σ = 52898400. Its totient is φ = 6734208.

The previous prime is 20339663. The next prime is 20339681. The reversal of 20339664 is 46693302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20339663) 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, 6187 + ... + 8885.

It is an arithmetic number, because the mean of its divisors is an integer number (1322460).

Almost surely, 2^20339664 is an apocalyptic number.

20339664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20339664 is an abundant number, since it is smaller than the sum of its proper divisors (32558736).

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

20339664 is a wasteful number, since it uses less digits than its factorization.

20339664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867 (or 2861 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 20339664 is about 4509.9516627121. The cubic root of 20339664 is about 272.9697936497.

The spelling of 20339664 in words is "twenty million, three hundred thirty-nine thousand, six hundred sixty-four".