20111538725 has 12 divisors (see below), whose sum is σ = 24942036420. Its totient is φ = 16086825600.

The previous prime is 20111538649. The next prime is 20111538743. The reversal of 20111538725 is 52783511102.

It can be written as a sum of positive squares in 6 ways, for example, as 323208484 + 19788330241 = 17978^2 + 140671^2 .

It is not a de Polignac number, because 20111538725 - 2¹⁶ = 20111473189 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121145 + ... + 234305.

It is an arithmetic number, because the mean of its divisors is an integer number (2078503035).

Almost surely, 2^20111538725 is an apocalyptic number.

20111538725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20111538725 is a deficient number, since it is larger than the sum of its proper divisors (4830497695).

20111538725 is a wasteful number, since it uses less digits than its factorization.

20111538725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120280 (or 120275 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 35.

The spelling of 20111538725 in words is "twenty billion, one hundred eleven million, five hundred thirty-eight thousand, seven hundred twenty-five".