20744991400 has 96 divisors (see below), whose sum is σ = 56467010880. Its totient is φ = 6939072000.

The previous prime is 20744991313. The next prime is 20744991451. The reversal of 20744991400 is 419944702.

It is a Harshad number since it is a multiple of its sum of digits (40).

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 23 ways as a sum of consecutive naturals, for example, 123306 + ... + 238105.

It is an arithmetic number, because the mean of its divisors is an integer number (588198030).

Almost surely, 2^20744991400 is an apocalyptic number.

20744991400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20744991400 is an abundant number, since it is smaller than the sum of its proper divisors (35722019480).

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

20744991400 is a wasteful number, since it uses less digits than its factorization.

20744991400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361475 (or 361466 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 20744991400 in words is "twenty billion, seven hundred forty-four million, nine hundred ninety-one thousand, four hundred".