20297396857 has 8 divisors (see below), whose sum is σ = 21500759016. Its totient is φ = 19095078912.

The previous prime is 20297396851. The next prime is 20297396863. The reversal of 20297396857 is 75869379202.

It is an interprime number because it is at equal distance from previous prime (20297396851) and next prime (20297396863).

It can be written as a sum of positive squares in 4 ways, for example, as 561642601 + 19735754256 = 23699^2 + 140484^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20297396857 - 2⁷ = 20297396729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20297396851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220848 + ... + 298945.

It is an arithmetic number, because the mean of its divisors is an integer number (2687594877).

Almost surely, 2^20297396857 is an apocalyptic number.

It is an amenable number.

20297396857 is a deficient number, since it is larger than the sum of its proper divisors (1203362159).

20297396857 is a wasteful number, since it uses less digits than its factorization.

20297396857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522107.

The product of its (nonzero) digits is 11430720, while the sum is 58.

The spelling of 20297396857 in words is "twenty billion, two hundred ninety-seven million, three hundred ninety-six thousand, eight hundred fifty-seven".