20808990744 has 64 divisors (see below), whose sum is σ = 54648864000. Its totient is φ = 6590196096.

The previous prime is 20808990733. The next prime is 20808990749. The reversal of 20808990744 is 44709980802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808990749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44254 + ... + 208749.

It is an arithmetic number, because the mean of its divisors is an integer number (853888500).

Almost surely, 2^20808990744 is an apocalyptic number.

20808990744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20808990744 is an abundant number, since it is smaller than the sum of its proper divisors (33839873256).

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

20808990744 is a wasteful number, since it uses less digits than its factorization.

20808990744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253184 (or 253180 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 20808990744 in words is "twenty billion, eight hundred eight million, nine hundred ninety thousand, seven hundred forty-four".