20313009 has 6 divisors (see below), whose sum is σ = 29341026. Its totient is φ = 13542000.

The previous prime is 20313001. The next prime is 20313047. The reversal of 20313009 is 90031302.

It can be written as a sum of positive squares in only one way, i.e., 20223009 + 90000 = 4497^2 + 300^2 .

It is not a de Polignac number, because 20313009 - 2³ = 20313001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20312982 and 20313000.

It is not an unprimeable number, because it can be changed into a prime (20313001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1128492 + ... + 1128509.

It is an arithmetic number, because the mean of its divisors is an integer number (4890171).

Almost surely, 2^20313009 is an apocalyptic number.

It is an amenable number.

20313009 is a deficient number, since it is larger than the sum of its proper divisors (9028017).

20313009 is a wasteful number, since it uses less digits than its factorization.

20313009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257007 (or 2257004 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 20313009 is about 4506.9955624562. The cubic root of 20313009 is about 272.8504997985.

The spelling of 20313009 in words is "twenty million, three hundred thirteen thousand, nine".