20964760253 has 4 divisors (see below), whose sum is σ = 21180891900. Its totient is φ = 20748628608.

The previous prime is 20964760249. The next prime is 20964760277. The reversal of 20964760253 is 35206746902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14738445604 + 6226314649 = 121402^2 + 78907^2 .

It is a cyclic number.

It is not a de Polignac number, because 20964760253 - 2² = 20964760249 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964760753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108065678 + ... + 108065871.

It is an arithmetic number, because the mean of its divisors is an integer number (5295222975).

Almost surely, 2^20964760253 is an apocalyptic number.

It is an amenable number.

20964760253 is a deficient number, since it is larger than the sum of its proper divisors (216131647).

20964760253 is an equidigital number, since it uses as much as digits as its factorization.

20964760253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216131646.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 20964760253 in words is "twenty billion, nine hundred sixty-four million, seven hundred sixty thousand, two hundred fifty-three".