20907165 has 16 divisors (see below), whose sum is σ = 33523776. Its totient is φ = 11126400.

The previous prime is 20907137. The next prime is 20907167. The reversal of 20907165 is 56170902.

It is not a de Polignac number, because 20907165 - 2⁷ = 20907037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20907167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7345 + ... + 9785.

It is an arithmetic number, because the mean of its divisors is an integer number (2095236).

Almost surely, 2^20907165 is an apocalyptic number.

It is an amenable number.

20907165 is a deficient number, since it is larger than the sum of its proper divisors (12616611).

20907165 is a wasteful number, since it uses less digits than its factorization.

20907165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020.

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 20907165 is about 4572.4353467272. The cubic root of 20907165 is about 275.4852699022.

The spelling of 20907165 in words is "twenty million, nine hundred seven thousand, one hundred sixty-five".