20993959267 has 16 divisors (see below), whose sum is σ = 21934245312. Its totient is φ = 20074862080.

The previous prime is 20993959253. The next prime is 20993959307. The reversal of 20993959267 is 76295939902.

It is a cyclic number.

It is not a de Polignac number, because 20993959267 - 2⁷ = 20993959139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20993951267) 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, 2379378 + ... + 2388184.

It is an arithmetic number, because the mean of its divisors is an integer number (1370890332).

Almost surely, 2^20993959267 is an apocalyptic number.

20993959267 is a deficient number, since it is larger than the sum of its proper divisors (940286045).

20993959267 is a wasteful number, since it uses less digits than its factorization.

20993959267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9998.

The product of its (nonzero) digits is 16533720, while the sum is 61.

The spelling of 20993959267 in words is "twenty billion, nine hundred ninety-three million, nine hundred fifty-nine thousand, two hundred sixty-seven".