20895139 has 2 divisors, whose sum is σ = 20895140. Its totient is φ = 20895138.

The previous prime is 20895107. The next prime is 20895143. The reversal of 20895139 is 93159802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20895139 - 2⁵ = 20895107 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20895098 and 20895107.

It is not a weakly prime, because it can be changed into another prime (20895179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10447569 + 10447570.

It is an arithmetic number, because the mean of its divisors is an integer number (10447570).

Almost surely, 2^20895139 is an apocalyptic number.

20895139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20895139 is an equidigital number, since it uses as much as digits as its factorization.

20895139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 20895139 is about 4571.1201034320. The cubic root of 20895139 is about 275.4324391895.

The spelling of 20895139 in words is "twenty million, eight hundred ninety-five thousand, one hundred thirty-nine".