20645303818 has 8 divisors (see below), whose sum is σ = 31012134660. Its totient is φ = 10307925600.

The previous prime is 20645303779. The next prime is 20645303831. The reversal of 20645303818 is 81830354602.

It can be written as a sum of positive squares in 2 ways, for example, as 20633311449 + 11992369 = 143643^2 + 3463^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 7361403 + ... + 7364206.

Almost surely, 2^20645303818 is an apocalyptic number.

20645303818 is a deficient number, since it is larger than the sum of its proper divisors (10366830842).

20645303818 is a wasteful number, since it uses less digits than its factorization.

20645303818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14726312.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 20645303818 in words is "twenty billion, six hundred forty-five million, three hundred three thousand, eight hundred eighteen".