20994729600 has 192 divisors, whose sum is σ = 74471171040. Its totient is φ = 5167902720.

The previous prime is 20994729599. The next prime is 20994729601. The reversal of 20994729600 is 692749902.

It is an interprime number because it is at equal distance from previous prime (20994729599) and next prime (20994729601).

It is a tau number, because it is divible by the number of its divisors (192).

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 20994729600.

It is not an unprimeable number, because it can be changed into a prime (20994729601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40687 + ... + 208913.

Almost surely, 2^20994729600 is an apocalyptic number.

20994729600 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 20994729600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37235585520).

20994729600 is an abundant number, since it is smaller than the sum of its proper divisors (53476441440).

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

20994729600 is a wasteful number, since it uses less digits than its factorization.

20994729600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168267 (or 168250 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The spelling of 20994729600 in words is "twenty billion, nine hundred ninety-four million, seven hundred twenty-nine thousand, six hundred".