20090206165 has 16 divisors (see below), whose sum is σ = 25286637312. Its totient is φ = 15305056704.

The previous prime is 20090206163. The next prime is 20090206181. The reversal of 20090206165 is 56160209002.

It is a cyclic number.

It is not a de Polignac number, because 20090206165 - 2¹ = 20090206163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20090206163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1146579 + ... + 1163968.

It is an arithmetic number, because the mean of its divisors is an integer number (1580414832).

Almost surely, 2^20090206165 is an apocalyptic number.

It is an amenable number.

20090206165 is a deficient number, since it is larger than the sum of its proper divisors (5196431147).

20090206165 is a wasteful number, since it uses less digits than its factorization.

20090206165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310636.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 20090206165 in words is "twenty billion, ninety million, two hundred six thousand, one hundred sixty-five".