20405118200867 has 2 divisors, whose sum is σ = 20405118200868. Its totient is φ = 20405118200866.

The previous prime is 20405118200809. The next prime is 20405118200911. The reversal of 20405118200867 is 76800281150402.

It is an a-pointer prime, because the next prime (20405118200911) can be obtained adding 20405118200867 to its sum of digits (44).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20405118200867 - 2¹⁶ = 20405118135331 is a prime.

It is not a weakly prime, because it can be changed into another prime (20405118220867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202559100433 + 10202559100434.

It is an arithmetic number, because the mean of its divisors is an integer number (10202559100434).

Almost surely, 2^{20405118200867} is an apocalyptic number.

20405118200867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405118200867 is an equidigital number, since it uses as much as digits as its factorization.

20405118200867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 20405118200867 in words is "twenty trillion, four hundred five billion, one hundred eighteen million, two hundred thousand, eight hundred sixty-seven".