20408039 has 2 divisors, whose sum is σ = 20408040. Its totient is φ = 20408038.

The previous prime is 20408029. The next prime is 20408051. The reversal of 20408039 is 93080402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20408039 - 2¹⁶ = 20342503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20407999 and 20408017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20408029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204019 + 10204020.

It is an arithmetic number, because the mean of its divisors is an integer number (10204020).

Almost surely, 2^20408039 is an apocalyptic number.

20408039 is a deficient number, since it is larger than the sum of its proper divisors (1).

20408039 is an equidigital number, since it uses as much as digits as its factorization.

20408039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20408039 is about 4517.5257608563. The cubic root of 20408039 is about 273.2753285931.

The spelling of 20408039 in words is "twenty million, four hundred eight thousand, thirty-nine".