20138562125 has 16 divisors (see below), whose sum is σ = 27417738816. Its totient is φ = 14646226000.

The previous prime is 20138562097. The next prime is 20138562139. The reversal of 20138562125 is 52126583102.

It is not a de Polignac number, because 20138562125 - 2⁸ = 20138561869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7321739 + ... + 7324488.

It is an arithmetic number, because the mean of its divisors is an integer number (1713608676).

Almost surely, 2^20138562125 is an apocalyptic number.

20138562125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20138562125 is a deficient number, since it is larger than the sum of its proper divisors (7279176691).

20138562125 is a wasteful number, since it uses less digits than its factorization.

20138562125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14646253 (or 14646243 counting only the distinct ones).

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

The spelling of 20138562125 in words is "twenty billion, one hundred thirty-eight million, five hundred sixty-two thousand, one hundred twenty-five".