20408185939 has 2 divisors, whose sum is σ = 20408185940. Its totient is φ = 20408185938.

The previous prime is 20408185907. The next prime is 20408185951. The reversal of 20408185939 is 93958180402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20408185939 - 2⁵ = 20408185907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20408185892 and 20408185901.

It is not a weakly prime, because it can be changed into another prime (20408185999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204092969 + 10204092970.

It is an arithmetic number, because the mean of its divisors is an integer number (10204092970).

Almost surely, 2^20408185939 is an apocalyptic number.

20408185939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20408185939 is an equidigital number, since it uses as much as digits as its factorization.

20408185939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 20408185939 in words is "twenty billion, four hundred eight million, one hundred eighty-five thousand, nine hundred thirty-nine".