20943253 has 2 divisors, whose sum is σ = 20943254. Its totient is φ = 20943252.

The previous prime is 20943203. The next prime is 20943257. The reversal of 20943253 is 35234902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20729809 + 213444 = 4553^2 + 462^2 .

It is a cyclic number.

It is not a de Polignac number, because 20943253 - 2⁹ = 20942741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20943257) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471626 + 10471627.

It is an arithmetic number, because the mean of its divisors is an integer number (10471627).

Almost surely, 2^20943253 is an apocalyptic number.

It is an amenable number.

20943253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20943253 is an equidigital number, since it uses as much as digits as its factorization.

20943253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 20943253 is about 4576.3799011883. The cubic root of 20943253 is about 275.6436844576.

The spelling of 20943253 in words is "twenty million, nine hundred forty-three thousand, two hundred fifty-three".