20364139 has 2 divisors, whose sum is σ = 20364140. Its totient is φ = 20364138.

The previous prime is 20364109. The next prime is 20364151. The reversal of 20364139 is 93146302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20364139 - 2⁹ = 20363627 is a prime.

It is a super-2 number, since 2×20364139² = 829396314422642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20364109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182069 + 10182070.

It is an arithmetic number, because the mean of its divisors is an integer number (10182070).

Almost surely, 2^20364139 is an apocalyptic number.

20364139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20364139 is an equidigital number, since it uses as much as digits as its factorization.

20364139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 20364139 is about 4512.6642906381. The cubic root of 20364139 is about 273.0792392094.

It can be divided in two parts, 20364 and 139, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 20364139 in words is "twenty million, three hundred sixty-four thousand, one hundred thirty-nine".