20420440039 has 2 divisors, whose sum is σ = 20420440040. Its totient is φ = 20420440038.

The previous prime is 20420439989. The next prime is 20420440043. The reversal of 20420440039 is 93004402402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20420440039 - 2²⁹ = 19883569127 is a prime.

It is a super-3 number, since 3×20420440039³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20420439989 and 20420440016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420441039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210220019 + 10210220020.

It is an arithmetic number, because the mean of its divisors is an integer number (10210220020).

Almost surely, 2^20420440039 is an apocalyptic number.

20420440039 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420440039 is an equidigital number, since it uses as much as digits as its factorization.

20420440039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The spelling of 20420440039 in words is "twenty billion, four hundred twenty million, four hundred forty thousand, thirty-nine".