20265800164 has 81 divisors (see below), whose sum is σ = 38890502427. Its totient is φ = 9238464768.

The previous prime is 20265800141. The next prime is 20265800171. The reversal of 20265800164 is 46100856202.

The square root of 20265800164 is 142358.

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

It can be written as a sum of positive squares in 4 ways, for example, as 5077702564 + 15188097600 = 71258^2 + 123240^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 256529077 + ... + 256529155.

Almost surely, 2^20265800164 is an apocalyptic number.

20265800164 is the 142358-th square number.

It is an amenable number.

20265800164 is a deficient number, since it is larger than the sum of its proper divisors (18624702263).

20265800164 is an equidigital number, since it uses as much as digits as its factorization.

20265800164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 20265800164 in words is "twenty billion, two hundred sixty-five million, eight hundred thousand, one hundred sixty-four".