20869509312 has 42 divisors (see below), whose sum is σ = 59818681988. Its totient is φ = 6956502912.

The previous prime is 20869509289. The next prime is 20869509317. The reversal of 20869509312 is 21390596802.

It is not an unprimeable number, because it can be changed into a prime (20869509317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18115318 + ... + 18116469.

Almost surely, 2^20869509312 is an apocalyptic number.

It is an amenable number.

20869509312 is an abundant number, since it is smaller than the sum of its proper divisors (38949172676).

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

20869509312 is a wasteful number, since it uses less digits than its factorization.

20869509312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36231805 (or 36231792 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 20869509312 in words is "twenty billion, eight hundred sixty-nine million, five hundred nine thousand, three hundred twelve".