20018912279 has 2 divisors, whose sum is σ = 20018912280. Its totient is φ = 20018912278.

The previous prime is 20018912233. The next prime is 20018912357. The reversal of 20018912279 is 97221981002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20018912279 - 2²⁴ = 20002135063 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20018912219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009456139 + 10009456140.

It is an arithmetic number, because the mean of its divisors is an integer number (10009456140).

Almost surely, 2^20018912279 is an apocalyptic number.

20018912279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018912279 is an equidigital number, since it uses as much as digits as its factorization.

20018912279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 20018912279 in words is "twenty billion, eighteen million, nine hundred twelve thousand, two hundred seventy-nine".