20641253 has 2 divisors, whose sum is σ = 20641254. Its totient is φ = 20641252.

The previous prime is 20641223. The next prime is 20641259. The reversal of 20641253 is 35214602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 4464769 = 4022^2 + 2113^2 .

It is a cyclic number.

It is not a de Polignac number, because 20641253 - 2¹⁸ = 20379109 is a prime.

It is a super-2 number, since 2×20641253² = 852122650820018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20641259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320626 + 10320627.

It is an arithmetic number, because the mean of its divisors is an integer number (10320627).

Almost surely, 2^20641253 is an apocalyptic number.

It is an amenable number.

20641253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641253 is an equidigital number, since it uses as much as digits as its factorization.

20641253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20641253 is about 4543.2645751706. The cubic root of 20641253 is about 274.3123447167.

Adding to 20641253 its reverse (35214602), we get a palindrome (55855855).

The spelling of 20641253 in words is "twenty million, six hundred forty-one thousand, two hundred fifty-three".