20839964564 has 24 divisors (see below), whose sum is σ = 36660169728. Its totient is φ = 10365713600.

The previous prime is 20839964531. The next prime is 20839964597. The reversal of 20839964564 is 46546993802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20839964531) and next prime (20839964597).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063019 + ... + 1082445.

It is an arithmetic number, because the mean of its divisors is an integer number (1527507072).

Almost surely, 2^20839964564 is an apocalyptic number.

It is an amenable number.

20839964564 is a deficient number, since it is larger than the sum of its proper divisors (15820205164).

20839964564 is a wasteful number, since it uses less digits than its factorization.

20839964564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20815 (or 20813 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 20839964564 in words is "twenty billion, eight hundred thirty-nine million, nine hundred sixty-four thousand, five hundred sixty-four".