20465839 has 2 divisors, whose sum is σ = 20465840. Its totient is φ = 20465838.

The previous prime is 20465833. The next prime is 20465843. The reversal of 20465839 is 93856402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20465839 - 2¹⁵ = 20433071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20465798 and 20465807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20465833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232919 + 10232920.

It is an arithmetic number, because the mean of its divisors is an integer number (10232920).

Almost surely, 2^20465839 is an apocalyptic number.

20465839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20465839 is an equidigital number, since it uses as much as digits as its factorization.

20465839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20465839 is about 4523.9185448016. The cubic root of 20465839 is about 273.5330771122.

The spelling of 20465839 in words is "twenty million, four hundred sixty-five thousand, eight hundred thirty-nine".