20331009 has 12 divisors (see below), whose sum is σ = 30314752. Its totient is φ = 13116600.

The previous prime is 20330993. The next prime is 20331023. The reversal of 20331009 is 90013302.

It is not a de Polignac number, because 20331009 - 2⁴ = 20330993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20330982 and 20331000.

It is not an unprimeable number, because it can be changed into a prime (20331079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36157 + ... + 36714.

Almost surely, 2^20331009 is an apocalyptic number.

It is an amenable number.

20331009 is a deficient number, since it is larger than the sum of its proper divisors (9983743).

20331009 is a wasteful number, since it uses less digits than its factorization.

20331009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72908 (or 72905 counting only the distinct ones).

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

The square root of 20331009 is about 4508.9920159610. The cubic root of 20331009 is about 272.9310698250.

The spelling of 20331009 in words is "twenty million, three hundred thirty-one thousand, nine".