20018912357 has 2 divisors, whose sum is σ = 20018912358. Its totient is φ = 20018912356.

The previous prime is 20018912279. The next prime is 20018912363. The reversal of 20018912357 is 75321981002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16115286916 + 3903625441 = 126946^2 + 62479^2 .

It is a cyclic number.

It is not a de Polignac number, because 20018912357 - 2⁸ = 20018912101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20018912357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20018912057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009456178 + 10009456179.

It is an arithmetic number, because the mean of its divisors is an integer number (10009456179).

Almost surely, 2^20018912357 is an apocalyptic number.

It is an amenable number.

20018912357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018912357 is an equidigital number, since it uses as much as digits as its factorization.

20018912357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 20018912357 in words is "twenty billion, eighteen million, nine hundred twelve thousand, three hundred fifty-seven".