20015225636 has 12 divisors (see below), whose sum is σ = 40030451328. Its totient is φ = 8577953832.

The previous prime is 20015225557. The next prime is 20015225647. The reversal of 20015225636 is 63652251002.

20015225636 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357414716 + ... + 357414771.

It is an arithmetic number, because the mean of its divisors is an integer number (3335870944).

Almost surely, 2^20015225636 is an apocalyptic number.

It is an amenable number.

20015225636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20015225636 is a wasteful number, since it uses less digits than its factorization.

20015225636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714829498 (or 714829496 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 20015225636 its reverse (63652251002), we get a palindrome (83667476638).

The spelling of 20015225636 in words is "twenty billion, fifteen million, two hundred twenty-five thousand, six hundred thirty-six".