20599391 has 2 divisors, whose sum is σ = 20599392. Its totient is φ = 20599390.

The previous prime is 20599387. The next prime is 20599433. The reversal of 20599391 is 19399502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20599391 - 2² = 20599387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20599331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10299695 + 10299696.

It is an arithmetic number, because the mean of its divisors is an integer number (10299696).

Almost surely, 2^20599391 is an apocalyptic number.

20599391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20599391 is an equidigital number, since it uses as much as digits as its factorization.

20599391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 20599391 is about 4538.6551973024. The cubic root of 20599391 is about 274.1267772497.

The spelling of 20599391 in words is "twenty million, five hundred ninety-nine thousand, three hundred ninety-one".