20329987253 has 2 divisors, whose sum is σ = 20329987254. Its totient is φ = 20329987252.

The previous prime is 20329987211. The next prime is 20329987283. The reversal of 20329987253 is 35278992302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18720533329 + 1609453924 = 136823^2 + 40118^2 .

It is a cyclic number.

It is not a de Polignac number, because 20329987253 - 2²⁴ = 20313210037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20329987283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164993626 + 10164993627.

It is an arithmetic number, because the mean of its divisors is an integer number (10164993627).

Almost surely, 2^20329987253 is an apocalyptic number.

It is an amenable number.

20329987253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20329987253 is an equidigital number, since it uses as much as digits as its factorization.

20329987253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 20329987253 in words is "twenty billion, three hundred twenty-nine million, nine hundred eighty-seven thousand, two hundred fifty-three".