20613253 has 2 divisors, whose sum is σ = 20613254. Its totient is φ = 20613252.

The previous prime is 20613239. The next prime is 20613269. The reversal of 20613253 is 35231602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19070689 + 1542564 = 4367^2 + 1242^2 .

It is a cyclic number.

It is not a de Polignac number, because 20613253 - 2⁹ = 20612741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20613053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306626 + 10306627.

It is an arithmetic number, because the mean of its divisors is an integer number (10306627).

Almost surely, 2^20613253 is an apocalyptic number.

It is an amenable number.

20613253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20613253 is an equidigital number, since it uses as much as digits as its factorization.

20613253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20613253 is about 4540.1820448083. The cubic root of 20613253 is about 274.1882530693.

Adding to 20613253 its reverse (35231602), we get a palindrome (55844855).

The spelling of 20613253 in words is "twenty million, six hundred thirteen thousand, two hundred fifty-three".