20410139 has 2 divisors, whose sum is σ = 20410140. Its totient is φ = 20410138.

The previous prime is 20410129. The next prime is 20410163. The reversal of 20410139 is 93101402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20410139 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20410139.

It is not a weakly prime, because it can be changed into another prime (20410109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10205069 + 10205070.

It is an arithmetic number, because the mean of its divisors is an integer number (10205070).

Almost surely, 2^20410139 is an apocalyptic number.

20410139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20410139 is an equidigital number, since it uses as much as digits as its factorization.

20410139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 20410139 is about 4517.7581829930. The cubic root of 20410139 is about 273.2847016725.

The spelling of 20410139 in words is "twenty million, four hundred ten thousand, one hundred thirty-nine".