20993928995 has 16 divisors (see below), whose sum is σ = 27590461920. Its totient is φ = 15240440064.

The previous prime is 20993928979. The next prime is 20993928997. The reversal of 20993928995 is 59982939902.

It is a cyclic number.

It is not a de Polignac number, because 20993928995 - 2⁴ = 20993928979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is not an unprimeable number, because it can be changed into a prime (20993928997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2733314 + ... + 2740983.

It is an arithmetic number, because the mean of its divisors is an integer number (1724403870).

Almost surely, 2^20993928995 is an apocalyptic number.

20993928995 is a deficient number, since it is larger than the sum of its proper divisors (6596532925).

20993928995 is a wasteful number, since it uses less digits than its factorization.

20993928995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5474374.

The product of its (nonzero) digits is 28343520, while the sum is 65.

The spelling of 20993928995 in words is "twenty billion, nine hundred ninety-three million, nine hundred twenty-eight thousand, nine hundred ninety-five".