20265138125 has 10 divisors (see below), whose sum is σ = 25323317382. Its totient is φ = 16212110000.

The previous prime is 20265138077. The next prime is 20265138197. The reversal of 20265138125 is 52183156202.

It can be written as a sum of positive squares in 5 ways, for example, as 3913378249 + 16351759876 = 62557^2 + 127874^2 .

It is not a de Polignac number, because 20265138125 - 2²² = 20260943821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16211486 + ... + 16212735.

Almost surely, 2^20265138125 is an apocalyptic number.

20265138125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20265138125 is a deficient number, since it is larger than the sum of its proper divisors (5058179257).

20265138125 is an frugal number, since it uses more digits than its factorization.

20265138125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32424241 (or 32424226 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 20265138125 in words is "twenty billion, two hundred sixty-five million, one hundred thirty-eight thousand, one hundred twenty-five".