20202400139 has 4 divisors (see below), whose sum is σ = 20206871256. Its totient is φ = 20197929024.

The previous prime is 20202400117. The next prime is 20202400151. The reversal of 20202400139 is 93100420202.

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

It is a cyclic number.

It is not a de Polignac number, because 20202400139 - 2²⁰ = 20201351563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20202600139) 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, 2228774 + ... + 2237819.

It is an arithmetic number, because the mean of its divisors is an integer number (5051717814).

Almost surely, 2^20202400139 is an apocalyptic number.

20202400139 is a deficient number, since it is larger than the sum of its proper divisors (4471117).

20202400139 is an equidigital number, since it uses as much as digits as its factorization.

20202400139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471116.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 20202400139 in words is "twenty billion, two hundred two million, four hundred thousand, one hundred thirty-nine".