20680198393 has 4 divisors (see below), whose sum is σ = 20685654388. Its totient is φ = 20674742400.

The previous prime is 20680198307. The next prime is 20680198433. The reversal of 20680198393 is 39389108602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8819463744 + 11860734649 = 93912^2 + 108907^2 .

It is a cyclic number.

It is not a de Polignac number, because 20680198393 - 2¹⁷ = 20680067321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20680198193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2722308 + ... + 2729893.

It is an arithmetic number, because the mean of its divisors is an integer number (5171413597).

Almost surely, 2^20680198393 is an apocalyptic number.

It is an amenable number.

20680198393 is a deficient number, since it is larger than the sum of its proper divisors (5455995).

20680198393 is an equidigital number, since it uses as much as digits as its factorization.

20680198393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5455994.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 20680198393 in words is "twenty billion, six hundred eighty million, one hundred ninety-eight thousand, three hundred ninety-three".