20188725 has 12 divisors (see below), whose sum is σ = 33378816. Its totient is φ = 10767280.

The previous prime is 20188723. The next prime is 20188739. The reversal of 20188725 is 52788102.

It is not a de Polignac number, because 20188725 - 2¹ = 20188723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20188723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134517 + ... + 134666.

It is an arithmetic number, because the mean of its divisors is an integer number (2781568).

Almost surely, 2^20188725 is an apocalyptic number.

20188725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20188725 is a deficient number, since it is larger than the sum of its proper divisors (13190091).

20188725 is a wasteful number, since it uses less digits than its factorization.

20188725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269196 (or 269191 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 20188725 is about 4493.1865084815. The cubic root of 20188725 is about 272.2928875426.

The spelling of 20188725 in words is "twenty million, one hundred eighty-eight thousand, seven hundred twenty-five".