20783239 has 2 divisors, whose sum is σ = 20783240. Its totient is φ = 20783238.

The previous prime is 20783221. The next prime is 20783267. The reversal of 20783239 is 93238702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20783239 is a prime.

It is a super-2 number, since 2×20783239² = 863886046662242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20783039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10391619 + 10391620.

It is an arithmetic number, because the mean of its divisors is an integer number (10391620).

Almost surely, 2^20783239 is an apocalyptic number.

20783239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20783239 is an equidigital number, since it uses as much as digits as its factorization.

20783239 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20783239 is about 4558.8637838830. The cubic root of 20783239 is about 274.9398832778.

The spelling of 20783239 in words is "twenty million, seven hundred eighty-three thousand, two hundred thirty-nine".