20397810793 has 4 divisors (see below), whose sum is σ = 20398097808. Its totient is φ = 20397523780.

The previous prime is 20397810781. The next prime is 20397810841. The reversal of 20397810793 is 39701879302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39701879302 = 2 ⋅19850939651.

It is a cyclic number.

It is not a de Polignac number, because 20397810793 - 2⁵ = 20397810761 is a prime.

It is a super-3 number, since 3×20397810793³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20397810703) 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, 50730 + ... + 208252.

It is an arithmetic number, because the mean of its divisors is an integer number (5099524452).

Almost surely, 2^20397810793 is an apocalyptic number.

It is an amenable number.

20397810793 is a deficient number, since it is larger than the sum of its proper divisors (287015).

20397810793 is a wasteful number, since it uses less digits than its factorization.

20397810793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287014.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 20397810793 in words is "twenty billion, three hundred ninety-seven million, eight hundred ten thousand, seven hundred ninety-three".