20672109 has 12 divisors (see below), whose sum is σ = 29981952. Its totient is φ = 13725000.

The previous prime is 20672083. The next prime is 20672123. The reversal of 20672109 is 90127602.

It is not a de Polignac number, because 20672109 - 2¹¹ = 20670061 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20672609) 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, 2317 + ... + 6834.

It is an arithmetic number, because the mean of its divisors is an integer number (2498496).

Almost surely, 2^20672109 is an apocalyptic number.

It is an amenable number.

20672109 is a deficient number, since it is larger than the sum of its proper divisors (9309843).

20672109 is a wasteful number, since it uses less digits than its factorization.

20672109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9408 (or 9405 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20672109 is about 4546.6591031218. The cubic root of 20672109 is about 274.4489638064.

The spelling of 20672109 in words is "twenty million, six hundred seventy-two thousand, one hundred nine".