20103139 has 4 divisors (see below), whose sum is σ = 22975024. Its totient is φ = 17231256.

The previous prime is 20103137. The next prime is 20103143. The reversal of 20103139 is 93130102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20103139 - 2¹ = 20103137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20103137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1435932 + ... + 1435945.

It is an arithmetic number, because the mean of its divisors is an integer number (5743756).

Almost surely, 2^20103139 is an apocalyptic number.

20103139 is a deficient number, since it is larger than the sum of its proper divisors (2871885).

20103139 is an equidigital number, since it uses as much as digits as its factorization.

20103139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871884.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 20103139 is about 4483.6524173937. The cubic root of 20103139 is about 271.9075657296.

The spelling of 20103139 in words is "twenty million, one hundred three thousand, one hundred thirty-nine".