20657373698 has 8 divisors (see below), whose sum is σ = 33369603708. Its totient is φ = 9534172464.

The previous prime is 20657373691. The next prime is 20657373707. The reversal of 20657373698 is 89637375602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20515692289 + 141681409 = 143233^2 + 11903^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20657373691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397257161 + ... + 397257212.

Almost surely, 2^20657373698 is an apocalyptic number.

20657373698 is a deficient number, since it is larger than the sum of its proper divisors (12712230010).

20657373698 is a wasteful number, since it uses less digits than its factorization.

20657373698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794514388.

The product of its (nonzero) digits is 11430720, while the sum is 56.

The spelling of 20657373698 in words is "twenty billion, six hundred fifty-seven million, three hundred seventy-three thousand, six hundred ninety-eight".