20636125 has 8 divisors (see below), whose sum is σ = 25754040. Its totient is φ = 16508800.

The previous prime is 20636123. The next prime is 20636137. The reversal of 20636125 is 52163602.

It can be written as a sum of positive squares in 4 ways, for example, as 5285401 + 15350724 = 2299^2 + 3918^2 .

It is not a de Polignac number, because 20636125 - 2¹ = 20636123 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20636125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82420 + ... + 82669.

It is an arithmetic number, because the mean of its divisors is an integer number (3219255).

Almost surely, 2^20636125 is an apocalyptic number.

20636125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20636125 is a deficient number, since it is larger than the sum of its proper divisors (5117915).

20636125 is an equidigital number, since it uses as much as digits as its factorization.

20636125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165104 (or 165094 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20636125 is about 4542.7001882141. The cubic root of 20636125 is about 274.2896266157.

Adding to 20636125 its reverse (52163602), we get a palindrome (72799727).

The spelling of 20636125 in words is "twenty million, six hundred thirty-six thousand, one hundred twenty-five".