20180725 has 12 divisors (see below), whose sum is σ = 25701604. Its totient is φ = 15707520.

The previous prime is 20180707. The next prime is 20180731. The reversal of 20180725 is 52708102.

It can be written as a sum of positive squares in 6 ways, for example, as 617796 + 19562929 = 786^2 + 4423^2 .

It is not a de Polignac number, because 20180725 - 2⁹ = 20180213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20180725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9984 + ... + 11833.

Almost surely, 2^20180725 is an apocalyptic number.

20180725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20180725 is a deficient number, since it is larger than the sum of its proper divisors (5520879).

20180725 is a wasteful number, since it uses less digits than its factorization.

20180725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21864 (or 21859 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 20180725 is about 4492.2961834679. The cubic root of 20180725 is about 272.2569164598.

Adding to 20180725 its reverse (52708102), we get a palindrome (72888827).

The spelling of 20180725 in words is "twenty million, one hundred eighty thousand, seven hundred twenty-five".