20505183693 has 4 divisors (see below), whose sum is σ = 27340244928. Its totient is φ = 13670122460.

The previous prime is 20505183689. The next prime is 20505183701. The reversal of 20505183693 is 39638150502.

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 20505183693 - 2² = 20505183689 is a prime.

It is a super-4 number, since 4×20505183693⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505183623) 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, 3417530613 + ... + 3417530618.

It is an arithmetic number, because the mean of its divisors is an integer number (6835061232).

Almost surely, 2^20505183693 is an apocalyptic number.

It is an amenable number.

20505183693 is a deficient number, since it is larger than the sum of its proper divisors (6835061235).

20505183693 is an equidigital number, since it uses as much as digits as its factorization.

20505183693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6835061234.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 20505183693 in words is "twenty billion, five hundred five million, one hundred eighty-three thousand, six hundred ninety-three".