20297700900 has 135 divisors (see below), whose sum is σ = 65838718561. Its totient is φ = 5409300960.

The previous prime is 20297700889. The next prime is 20297700949. The reversal of 20297700900 is 900779202.

The square root of 20297700900 is 142470.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7307172324 + 12990528576 = 85482^2 + 113976^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 12821509 + ... + 12823091.

Almost surely, 2^20297700900 is an apocalyptic number.

20297700900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20297700900 is the 142470-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20297700900

20297700900 is an abundant number, since it is smaller than the sum of its proper divisors (45541017661).

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

20297700900 is an equidigital number, since it uses as much as digits as its factorization.

20297700900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192 (or 1593 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

Multiplying 20297700900 by its sum of digits (36), we get a square (730717232400 = 854820²).

20297700900 divided by its sum of digits (36) gives a square (563825025 = 23745²).

Multiplying 20297700900 by its product of nonzero digits (15876), we get a square (322246299488400 = 17951220²).

The spelling of 20297700900 in words is "twenty billion, two hundred ninety-seven million, seven hundred thousand, nine hundred".