20228872725 has 36 divisors (see below), whose sum is σ = 36239815300. Its totient is φ = 10786452480.

The previous prime is 20228872723. The next prime is 20228872733. The reversal of 20228872725 is 52727882202.

It can be written as a sum of positive squares in 6 ways, for example, as 5818790961 + 14410081764 = 76281^2 + 120042^2 .

It is not a de Polignac number, because 20228872725 - 2¹ = 20228872723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20228872723) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 2003991 + ... + 2014059.

Almost surely, 2^20228872725 is an apocalyptic number.

20228872725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20228872725 is a deficient number, since it is larger than the sum of its proper divisors (16010942575).

20228872725 is a wasteful number, since it uses less digits than its factorization.

20228872725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19014 (or 19006 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 45.

The spelling of 20228872725 in words is "twenty billion, two hundred twenty-eight million, eight hundred seventy-two thousand, seven hundred twenty-five".