20015023656 has 16 divisors (see below), whose sum is σ = 50037559200. Its totient is φ = 6671674544.

The previous prime is 20015023619. The next prime is 20015023657. The reversal of 20015023656 is 65632051002.

It is not an unprimeable number, because it can be changed into a prime (20015023657) 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, 416979636 + ... + 416979683.

It is an arithmetic number, because the mean of its divisors is an integer number (3127347450).

Almost surely, 2^20015023656 is an apocalyptic number.

It is an amenable number.

20015023656 is an abundant number, since it is smaller than the sum of its proper divisors (30022535544).

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

20015023656 is a wasteful number, since it uses less digits than its factorization.

20015023656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833959328 (or 833959324 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 20015023656 its reverse (65632051002), we get a palindrome (85647074658).

The spelling of 20015023656 in words is "twenty billion, fifteen million, twenty-three thousand, six hundred fifty-six".