20716540253 has 4 divisors (see below), whose sum is σ = 21430903740. Its totient is φ = 20002176768.

The previous prime is 20716540223. The next prime is 20716540321. The reversal of 20716540253 is 35204561702.

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 4914290404 + 15802249849 = 70102^2 + 125707^2 .

It is a cyclic number.

It is not a de Polignac number, because 20716540253 - 2¹⁴ = 20716523869 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 (20716540223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357181700 + ... + 357181757.

It is an arithmetic number, because the mean of its divisors is an integer number (5357725935).

Almost surely, 2^20716540253 is an apocalyptic number.

It is an amenable number.

20716540253 is a deficient number, since it is larger than the sum of its proper divisors (714363487).

20716540253 is an equidigital number, since it uses as much as digits as its factorization.

20716540253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714363486.

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 20716540253 in words is "twenty billion, seven hundred sixteen million, five hundred forty thousand, two hundred fifty-three".