20901105 has 16 divisors (see below), whose sum is σ = 37157760. Its totient is φ = 11147184.

The previous prime is 20901091. The next prime is 20901107. The reversal of 20901105 is 50110902.

It is not a de Polignac number, because 20901105 - 2¹¹ = 20899057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20901107) 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, 77277 + ... + 77546.

It is an arithmetic number, because the mean of its divisors is an integer number (2322360).

Almost surely, 2^20901105 is an apocalyptic number.

It is an amenable number.

20901105 is a deficient number, since it is larger than the sum of its proper divisors (16256655).

20901105 is a wasteful number, since it uses less digits than its factorization.

20901105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154837 (or 154831 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 20901105 is about 4571.7726321417. The cubic root of 20901105 is about 275.4586506059.

The spelling of 20901105 in words is "twenty million, nine hundred one thousand, one hundred five".