20859253 has 2 divisors, whose sum is σ = 20859254. Its totient is φ = 20859252.

The previous prime is 20859233. The next prime is 20859269. The reversal of 20859253 is 35295802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20857489 + 1764 = 4567^2 + 42^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20859253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20859233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429626 + 10429627.

It is an arithmetic number, because the mean of its divisors is an integer number (10429627).

Almost surely, 2^20859253 is an apocalyptic number.

It is an amenable number.

20859253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20859253 is an equidigital number, since it uses as much as digits as its factorization.

20859253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 20859253 is about 4567.1931205063. The cubic root of 20859253 is about 275.2746699210.

It can be divided in two parts, 20859 and 253, that added together give a palindrome (21112).

The spelling of 20859253 in words is "twenty million, eight hundred fifty-nine thousand, two hundred fifty-three".