20733253 has 2 divisors, whose sum is σ = 20733254. Its totient is φ = 20733252.

The previous prime is 20733233. The next prime is 20733257. The reversal of 20733253 is 35233702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14493249 + 6240004 = 3807^2 + 2498^2 .

It is a cyclic number.

It is not a de Polignac number, because 20733253 - 2⁵ = 20733221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20733257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10366626 + 10366627.

It is an arithmetic number, because the mean of its divisors is an integer number (10366627).

Almost surely, 2^20733253 is an apocalyptic number.

It is an amenable number.

20733253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20733253 is an equidigital number, since it uses as much as digits as its factorization.

20733253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 25.

The square root of 20733253 is about 4553.3781964603. The cubic root of 20733253 is about 274.7192860026.

Adding to 20733253 its reverse (35233702), we get a palindrome (55966955).

The spelling of 20733253 in words is "twenty million, seven hundred thirty-three thousand, two hundred fifty-three".