20801165 has 32 divisors (see below), whose sum is σ = 31497984. Its totient is φ = 12810240.

The previous prime is 20801117. The next prime is 20801167. The reversal of 20801165 is 56110802.

It is not a de Polignac number, because 20801165 - 2⁶ = 20801101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20801165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37067 + ... + 37623.

It is an arithmetic number, because the mean of its divisors is an integer number (984312).

Almost surely, 2^20801165 is an apocalyptic number.

It is an amenable number.

20801165 is a deficient number, since it is larger than the sum of its proper divisors (10696819).

20801165 is a wasteful number, since it uses less digits than its factorization.

20801165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 20801165 is about 4560.8294201823. The cubic root of 20801165 is about 275.0189077909.

Adding to 20801165 its reverse (56110802), we get a palindrome (76911967).

The spelling of 20801165 in words is "twenty million, eight hundred one thousand, one hundred sixty-five".