20306662645 has 4 divisors (see below), whose sum is σ = 24367995180. Its totient is φ = 16245330112.

The previous prime is 20306662631. The next prime is 20306662679. The reversal of 20306662645 is 54626660302.

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 11021220324 + 9285442321 = 104982^2 + 96361^2 .

It is a cyclic number.

It is not a de Polignac number, because 20306662645 - 2¹⁹ = 20306138357 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20306662598 and 20306662607.

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, 2030666260 + ... + 2030666269.

It is an arithmetic number, because the mean of its divisors is an integer number (6091998795).

Almost surely, 2^20306662645 is an apocalyptic number.

It is an amenable number.

20306662645 is a deficient number, since it is larger than the sum of its proper divisors (4061332535).

20306662645 is an equidigital number, since it uses as much as digits as its factorization.

20306662645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061332534.

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 20306662645 in words is "twenty billion, three hundred six million, six hundred sixty-two thousand, six hundred forty-five".