20662649844 has 24 divisors (see below), whose sum is σ = 48358517088. Its totient is φ = 6866740320.

The previous prime is 20662649773. The next prime is 20662649857. The reversal of 20662649844 is 44894626602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2597067 + ... + 2605010.

It is an arithmetic number, because the mean of its divisors is an integer number (2014938212).

Almost surely, 2^20662649844 is an apocalyptic number.

It is an amenable number.

20662649844 is an abundant number, since it is smaller than the sum of its proper divisors (27695867244).

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

20662649844 is a wasteful number, since it uses less digits than its factorization.

20662649844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5202415 (or 5202413 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 51.

The spelling of 20662649844 in words is "twenty billion, six hundred sixty-two million, six hundred forty-nine thousand, eight hundred forty-four".