20313909 has 40 divisors (see below), whose sum is σ = 37844928. Its totient is φ = 10549440.

The previous prime is 20313871. The next prime is 20313913. The reversal of 20313909 is 90931302.

It is not a de Polignac number, because 20313909 - 2⁷ = 20313781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313989) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4609 + ... + 7865.

Almost surely, 2^20313909 is an apocalyptic number.

It is an amenable number.

20313909 is a deficient number, since it is larger than the sum of its proper divisors (17531019).

20313909 is a wasteful number, since it uses less digits than its factorization.

20313909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3278 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 20313909 is about 4507.0954061346. The cubic root of 20313909 is about 272.8545294300.

The spelling of 20313909 in words is "twenty million, three hundred thirteen thousand, nine hundred nine".