20340739 has 2 divisors, whose sum is σ = 20340740. Its totient is φ = 20340738.

The previous prime is 20340709. The next prime is 20340751. The reversal of 20340739 is 93704302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20340739 - 2¹³ = 20332547 is a prime.

It is a super-2 number, since 2×20340739² = 827491326132242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20340709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170369 + 10170370.

It is an arithmetic number, because the mean of its divisors is an integer number (10170370).

Almost surely, 2^20340739 is an apocalyptic number.

20340739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340739 is an equidigital number, since it uses as much as digits as its factorization.

20340739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20340739 is about 4510.0708420157. The cubic root of 20340739 is about 272.9746026009.

The spelling of 20340739 in words is "twenty million, three hundred forty thousand, seven hundred thirty-nine".