20315129 has 2 divisors, whose sum is σ = 20315130. Its totient is φ = 20315128.

The previous prime is 20315117. The next prime is 20315143. The reversal of 20315129 is 92151302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10549504 + 9765625 = 3248^2 + 3125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20315129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20315189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157564 + 10157565.

It is an arithmetic number, because the mean of its divisors is an integer number (10157565).

Almost surely, 2^20315129 is an apocalyptic number.

It is an amenable number.

20315129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315129 is an equidigital number, since it uses as much as digits as its factorization.

20315129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20315129 is about 4507.2307462565. The cubic root of 20315129 is about 272.8599916293.

The spelling of 20315129 in words is "twenty million, three hundred fifteen thousand, one hundred twenty-nine".