20620104397 has 4 divisors (see below), whose sum is σ = 20620470816. Its totient is φ = 20619737980.

The previous prime is 20620104383. The next prime is 20620104409. The reversal of 20620104397 is 79340102602.

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.

It is a cyclic number.

It is not a de Polignac number, because 20620104397 - 2⁷ = 20620104269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620104377) 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, 79063 + ... + 217924.

It is an arithmetic number, because the mean of its divisors is an integer number (5155117704).

Almost surely, 2^20620104397 is an apocalyptic number.

It is an amenable number.

20620104397 is a deficient number, since it is larger than the sum of its proper divisors (366419).

20620104397 is an equidigital number, since it uses as much as digits as its factorization.

20620104397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366418.

The product of its (nonzero) digits is 18144, while the sum is 34.

Adding to 20620104397 its reverse (79340102602), we get a palindrome (99960206999).

The spelling of 20620104397 in words is "twenty billion, six hundred twenty million, one hundred four thousand, three hundred ninety-seven".