20958973597 has 2 divisors, whose sum is σ = 20958973598. Its totient is φ = 20958973596.

The previous prime is 20958973589. The next prime is 20958973657. The reversal of 20958973597 is 79537985902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18341014041 + 2617959556 = 135429^2 + 51166^2 .

It is a cyclic number.

It is not a de Polignac number, because 20958973597 - 2³ = 20958973589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20958973507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10479486798 + 10479486799.

It is an arithmetic number, because the mean of its divisors is an integer number (10479486799).

Almost surely, 2^20958973597 is an apocalyptic number.

It is an amenable number.

20958973597 is a deficient number, since it is larger than the sum of its proper divisors (1).

20958973597 is an equidigital number, since it uses as much as digits as its factorization.

20958973597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42865200, while the sum is 64.

The spelling of 20958973597 in words is "twenty billion, nine hundred fifty-eight million, nine hundred seventy-three thousand, five hundred ninety-seven".