20368366685 has 4 divisors (see below), whose sum is σ = 24442040028. Its totient is φ = 16294693344.

The previous prime is 20368366679. The next prime is 20368366741. The reversal of 20368366685 is 58666386302.

It is a happy number.

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 13685958169 + 6682408516 = 116987^2 + 81746^2 .

It is a cyclic number.

It is not a de Polignac number, because 20368366685 - 2⁸ = 20368366429 is a prime.

It is a super-2 number, since 2×20368366685² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036836664 + ... + 2036836673.

It is an arithmetic number, because the mean of its divisors is an integer number (6110510007).

Almost surely, 2^20368366685 is an apocalyptic number.

It is an amenable number.

20368366685 is a deficient number, since it is larger than the sum of its proper divisors (4073673343).

20368366685 is an equidigital number, since it uses as much as digits as its factorization.

20368366685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073673342.

The product of its (nonzero) digits is 7464960, while the sum is 53.

The spelling of 20368366685 in words is "twenty billion, three hundred sixty-eight million, three hundred sixty-six thousand, six hundred eighty-five".