20321073253 has 12 divisors (see below), whose sum is σ = 22541177988. Its totient is φ = 18300397440.

The previous prime is 20321073239. The next prime is 20321073293. The reversal of 20321073253 is 35237012302.

It can be written as a sum of positive squares in 6 ways, for example, as 9847188289 + 10473884964 = 99233^2 + 102342^2 .

It is not a de Polignac number, because 20321073253 - 2¹⁷ = 20320942181 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 (20321073293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1459450 + ... + 1473307.

It is an arithmetic number, because the mean of its divisors is an integer number (1878431499).

Almost surely, 2^20321073253 is an apocalyptic number.

It is an amenable number.

20321073253 is a deficient number, since it is larger than the sum of its proper divisors (2220104735).

20321073253 is a wasteful number, since it uses less digits than its factorization.

20321073253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932824 (or 2932811 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 28.

Adding to 20321073253 its reverse (35237012302), we get a palindrome (55558085555).

The spelling of 20321073253 in words is "twenty billion, three hundred twenty-one million, seventy-three thousand, two hundred fifty-three".