20315009 has 16 divisors (see below), whose sum is σ = 25126080. Its totient is φ = 16148160.

The previous prime is 20314981. The next prime is 20315011. The reversal of 20315009 is 90051302.

It is a cyclic number.

It is not a de Polignac number, because 20315009 - 2⁸ = 20314753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20315069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1022 + ... + 6455.

It is an arithmetic number, because the mean of its divisors is an integer number (1570380).

Almost surely, 2^20315009 is an apocalyptic number.

It is an amenable number.

20315009 is a deficient number, since it is larger than the sum of its proper divisors (4811071).

20315009 is a wasteful number, since it uses less digits than its factorization.

20315009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7520.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 20315009 is about 4507.2174342936. The cubic root of 20315009 is about 272.8594543735.

The spelling of 20315009 in words is "twenty million, three hundred fifteen thousand, nine".