20275139 has 2 divisors, whose sum is σ = 20275140. Its totient is φ = 20275138.

The previous prime is 20275133. The next prime is 20275153. The reversal of 20275139 is 93157202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20275139 is a prime.

It is a super-2 number, since 2×20275139² = 822162522938642, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20275133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10137569 + 10137570.

It is an arithmetic number, because the mean of its divisors is an integer number (10137570).

Almost surely, 2^20275139 is an apocalyptic number.

20275139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20275139 is an equidigital number, since it uses as much as digits as its factorization.

20275139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 20275139 is about 4502.7923558610. The cubic root of 20275139 is about 272.6808338742.

The spelling of 20275139 in words is "twenty million, two hundred seventy-five thousand, one hundred thirty-nine".