20994604800 has 648 divisors, whose sum is σ = 79088156784. Its totient is φ = 4874895360.

The previous prime is 20994604783. The next prime is 20994604817. The reversal of 20994604800 is 840649902.

It is an interprime number because it is at equal distance from previous prime (20994604783) and next prime (20994604817).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 90105484 + ... + 90105716.

Almost surely, 2^20994604800 is an apocalyptic number.

20994604800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20994604800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39544078392).

20994604800 is an abundant number, since it is smaller than the sum of its proper divisors (58093551984).

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

20994604800 is a wasteful number, since it uses less digits than its factorization.

20994604800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 20994604800 in words is "twenty billion, nine hundred ninety-four million, six hundred four thousand, eight hundred".