20911125 has 16 divisors (see below), whose sum is σ = 34796736. Its totient is φ = 11152400.

The previous prime is 20911123. The next prime is 20911127. The reversal of 20911125 is 52111902.

It is an interprime number because it is at equal distance from previous prime (20911123) and next prime (20911127).

It is not a de Polignac number, because 20911125 - 2¹ = 20911123 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20911123) 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, 27507 + ... + 28256.

It is an arithmetic number, because the mean of its divisors is an integer number (2174796).

Almost surely, 2^20911125 is an apocalyptic number.

20911125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20911125 is a deficient number, since it is larger than the sum of its proper divisors (13885611).

20911125 is an equidigital number, since it uses as much as digits as its factorization.

20911125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55781 (or 55771 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 20911125 is about 4572.8683558572. The cubic root of 20911125 is about 275.5026619111.

The spelling of 20911125 in words is "twenty million, nine hundred eleven thousand, one hundred twenty-five".