20968583 has 2 divisors, whose sum is σ = 20968584. Its totient is φ = 20968582.

The previous prime is 20968579. The next prime is 20968613. The reversal of 20968583 is 38586902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20968583 - 2² = 20968579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20968583.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20968513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10484291 + 10484292.

It is an arithmetic number, because the mean of its divisors is an integer number (10484292).

Almost surely, 2^20968583 is an apocalyptic number.

20968583 is a deficient number, since it is larger than the sum of its proper divisors (1).

20968583 is an equidigital number, since it uses as much as digits as its factorization.

20968583 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 20968583 is about 4579.1465362008. The cubic root of 20968583 is about 275.7547662394.

The spelling of 20968583 in words is "twenty million, nine hundred sixty-eight thousand, five hundred eighty-three".