20117725 has 6 divisors (see below), whose sum is σ = 24946010. Its totient is φ = 16094160.

The previous prime is 20117723. The next prime is 20117731. The reversal of 20117725 is 52771102.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7027801 + 13089924 = 2651^2 + 3618^2 .

It is not a de Polignac number, because 20117725 - 2¹ = 20117723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 804709 = 20117725 / (2 + 0 + 1 + 1 + 7 + 7 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 20117725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402330 + ... + 402379.

Almost surely, 2^20117725 is an apocalyptic number.

20117725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20117725 is a deficient number, since it is larger than the sum of its proper divisors (4828285).

20117725 is an equidigital number, since it uses as much as digits as its factorization.

20117725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804719 (or 804714 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20117725 is about 4485.2786981413. The cubic root of 20117725 is about 271.9733114313.

Adding to 20117725 its reverse (52771102), we get a palindrome (72888827).

The spelling of 20117725 in words is "twenty million, one hundred seventeen thousand, seven hundred twenty-five".