20125636 has 12 divisors (see below), whose sum is σ = 37073680. Its totient is φ = 9533160.

The previous prime is 20125631. The next prime is 20125649. The reversal of 20125636 is 63652102.

It is a self number, because there is not a number n which added to its sum of digits gives 20125636.

It is not an unprimeable number, because it can be changed into a prime (20125631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132330 + ... + 132481.

Almost surely, 2^20125636 is an apocalyptic number.

It is an amenable number.

20125636 is a deficient number, since it is larger than the sum of its proper divisors (16948044).

20125636 is a wasteful number, since it uses less digits than its factorization.

20125636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264834 (or 264832 counting only the distinct ones).

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

The square root of 20125636 is about 4486.1604964602. The cubic root of 20125636 is about 272.0089565966.

Adding to 20125636 its reverse (63652102), we get a palindrome (83777738).

The spelling of 20125636 in words is "twenty million, one hundred twenty-five thousand, six hundred thirty-six".