20994567600 has 60 divisors (see below), whose sum is σ = 67252602056. Its totient is φ = 5598551040.

The previous prime is 20994567593. The next prime is 20994567613. The reversal of 20994567600 is 676549902.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20994567600.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8746537 + ... + 8748936.

Almost surely, 2^20994567600 is an apocalyptic number.

20994567600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20994567600 is an abundant number, since it is smaller than the sum of its proper divisors (46258034456).

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

20994567600 is a wasteful number, since it uses less digits than its factorization.

20994567600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17495494 (or 17495483 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 20994567600 in words is "twenty billion, nine hundred ninety-four million, five hundred sixty-seven thousand, six hundred".