20339287 has 2 divisors, whose sum is σ = 20339288. Its totient is φ = 20339286.

The previous prime is 20339273. The next prime is 20339311. The reversal of 20339287 is 78293302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20339287 - 2¹⁹ = 19814999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20339087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10169643 + 10169644.

It is an arithmetic number, because the mean of its divisors is an integer number (10169644).

Almost surely, 2^20339287 is an apocalyptic number.

20339287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20339287 is an equidigital number, since it uses as much as digits as its factorization.

20339287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20339287 is about 4509.9098660616. The cubic root of 20339287 is about 272.9681071215.

The spelling of 20339287 in words is "twenty million, three hundred thirty-nine thousand, two hundred eighty-seven".