20637213713 has 2 divisors, whose sum is σ = 20637213714. Its totient is φ = 20637213712.

The previous prime is 20637213683. The next prime is 20637213739. The reversal of 20637213713 is 31731273602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15508219024 + 5128994689 = 124532^2 + 71617^2 .

It is a cyclic number.

It is not a de Polignac number, because 20637213713 - 2²⁴ = 20620436497 is a prime.

It is not a weakly prime, because it can be changed into another prime (20637213613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318606856 + 10318606857.

It is an arithmetic number, because the mean of its divisors is an integer number (10318606857).

Almost surely, 2^20637213713 is an apocalyptic number.

It is an amenable number.

20637213713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20637213713 is an equidigital number, since it uses as much as digits as its factorization.

20637213713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The spelling of 20637213713 in words is "twenty billion, six hundred thirty-seven million, two hundred thirteen thousand, seven hundred thirteen".