20112139 has 8 divisors (see below), whose sum is σ = 21377088. Its totient is φ = 18856320.

The previous prime is 20112133. The next prime is 20112151. The reversal of 20112139 is 93121102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20112139 - 2⁵ = 20112107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20112133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2574 + ... + 6844.

It is an arithmetic number, because the mean of its divisors is an integer number (2672136).

Almost surely, 2^20112139 is an apocalyptic number.

20112139 is a deficient number, since it is larger than the sum of its proper divisors (1264949).

20112139 is a wasteful number, since it uses less digits than its factorization.

20112139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 20112139 is about 4484.6559511294. The cubic root of 20112139 is about 271.9481365577.

The spelling of 20112139 in words is "twenty million, one hundred twelve thousand, one hundred thirty-nine".