20518125 has 40 divisors (see below), whose sum is σ = 35388672. Its totient is φ = 10560000.

The previous prime is 20518123. The next prime is 20518153. The reversal of 20518125 is 52181502.

It is not a de Polignac number, because 20518125 - 2¹ = 20518123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20518095 and 20518104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20518123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 57949 + ... + 58301.

Almost surely, 2^20518125 is an apocalyptic number.

20518125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20518125 is a deficient number, since it is larger than the sum of its proper divisors (14870547).

20518125 is an equidigital number, since it uses as much as digits as its factorization.

20518125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 20518125 is about 4529.6936982538. The cubic root of 20518125 is about 273.7658192314.

Adding to 20518125 its reverse (52181502), we get a palindrome (72699627).

The spelling of 20518125 in words is "twenty million, five hundred eighteen thousand, one hundred twenty-five".