20353518506 has 8 divisors (see below), whose sum is σ = 30948500964. Its totient is φ = 10037351520.

The previous prime is 20353518469. The next prime is 20353518533. The reversal of 20353518506 is 60581535302.

It can be written as a sum of positive squares in 2 ways, for example, as 20289438481 + 64080025 = 142441^2 + 8005^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20353518506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69703685 + ... + 69703976.

Almost surely, 2^20353518506 is an apocalyptic number.

20353518506 is a deficient number, since it is larger than the sum of its proper divisors (10594982458).

20353518506 is a wasteful number, since it uses less digits than its factorization.

20353518506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139407736.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 20353518506 in words is "twenty billion, three hundred fifty-three million, five hundred eighteen thousand, five hundred six".