20705483237 has 2 divisors, whose sum is σ = 20705483238. Its totient is φ = 20705483236.

The previous prime is 20705483233. The next prime is 20705483299. The reversal of 20705483237 is 73238450702.

It is a Cunningham number, because it is equal to 143894²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20705483236 + 1 = 143894^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 20705483237 - 2² = 20705483233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20705483194 and 20705483203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20705483233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352741618 + 10352741619.

It is an arithmetic number, because the mean of its divisors is an integer number (10352741619).

Almost surely, 2^20705483237 is an apocalyptic number.

It is an amenable number.

20705483237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705483237 is an equidigital number, since it uses as much as digits as its factorization.

20705483237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 20705483237 in words is "twenty billion, seven hundred five million, four hundred eighty-three thousand, two hundred thirty-seven".