20858733697 has 2 divisors, whose sum is σ = 20858733698. Its totient is φ = 20858733696.

The previous prime is 20858733677. The next prime is 20858733737. The reversal of 20858733697 is 79633785802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20711815056 + 146918641 = 143916^2 + 12121^2 .

It is a cyclic number.

It is not a de Polignac number, because 20858733697 - 2²⁷ = 20724515969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20858733607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429366848 + 10429366849.

It is an arithmetic number, because the mean of its divisors is an integer number (10429366849).

Almost surely, 2^20858733697 is an apocalyptic number.

It is an amenable number.

20858733697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858733697 is an equidigital number, since it uses as much as digits as its factorization.

20858733697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15240960, while the sum is 58.

The spelling of 20858733697 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-three thousand, six hundred ninety-seven".