20413813187 has 2 divisors, whose sum is σ = 20413813188. Its totient is φ = 20413813186.

The previous prime is 20413813159. The next prime is 20413813201. The reversal of 20413813187 is 78131831402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20413813187 - 2¹⁸ = 20413551043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20413813187.

It is not a weakly prime, because it can be changed into another prime (20413813127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206906593 + 10206906594.

It is an arithmetic number, because the mean of its divisors is an integer number (10206906594).

Almost surely, 2^20413813187 is an apocalyptic number.

20413813187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20413813187 is an equidigital number, since it uses as much as digits as its factorization.

20413813187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 20413813187 in words is "twenty billion, four hundred thirteen million, eight hundred thirteen thousand, one hundred eighty-seven".