20011139 has 2 divisors, whose sum is σ = 20011140. Its totient is φ = 20011138.

The previous prime is 20011099. The next prime is 20011153. The reversal of 20011139 is 93111002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011139 - 2⁸ = 20010883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20014139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005569 + 10005570.

It is an arithmetic number, because the mean of its divisors is an integer number (10005570).

Almost surely, 2^20011139 is an apocalyptic number.

20011139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011139 is an equidigital number, since it uses as much as digits as its factorization.

20011139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 20011139 is about 4473.3811597046. The cubic root of 20011139 is about 271.4921454699.

The spelling of 20011139 in words is "twenty million, eleven thousand, one hundred thirty-nine".