20859233 has 2 divisors, whose sum is σ = 20859234. Its totient is φ = 20859232.

The previous prime is 20859199. The next prime is 20859253. The reversal of 20859233 is 33295802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19642624 + 1216609 = 4432^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 20859233 - 2¹⁶ = 20793697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20859233.

It is not a weakly prime, because it can be changed into another prime (20859253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429616 + 10429617.

It is an arithmetic number, because the mean of its divisors is an integer number (10429617).

Almost surely, 2^20859233 is an apocalyptic number.

It is an amenable number.

20859233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20859233 is an equidigital number, since it uses as much as digits as its factorization.

20859233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20859233 is about 4567.1909309772. The cubic root of 20859233 is about 275.2745819426.

The spelling of 20859233 in words is "twenty million, eight hundred fifty-nine thousand, two hundred thirty-three".