20868511084 has 12 divisors (see below), whose sum is σ = 36649860408. Its totient is φ = 10397122400.

The previous prime is 20868511051. The next prime is 20868511093. The reversal of 20868511084 is 48011586802.

It is a self number, because there is not a number n which added to its sum of digits gives 20868511084.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9282022 + ... + 9284269.

It is an arithmetic number, because the mean of its divisors is an integer number (3054155034).

Almost surely, 2^20868511084 is an apocalyptic number.

It is an amenable number.

20868511084 is a deficient number, since it is larger than the sum of its proper divisors (15781349324).

20868511084 is a wasteful number, since it uses less digits than its factorization.

20868511084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18566576 (or 18566574 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 20868511084 in words is "twenty billion, eight hundred sixty-eight million, five hundred eleven thousand, eighty-four".