20499667885 has 8 divisors (see below), whose sum is σ = 24607046520. Its totient is φ = 16394770944.

The previous prime is 20499667843. The next prime is 20499667913. The reversal of 20499667885 is 58876699402.

It can be written as a sum of positive squares in 4 ways, for example, as 804913641 + 19694754244 = 28371^2 + 140338^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20499667885 - 2²⁵ = 20466113453 is a prime.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 602200 + ... + 635329.

It is an arithmetic number, because the mean of its divisors is an integer number (3075880815).

Almost surely, 2^20499667885 is an apocalyptic number.

It is an amenable number.

20499667885 is a deficient number, since it is larger than the sum of its proper divisors (4107378635).

20499667885 is a wasteful number, since it uses less digits than its factorization.

20499667885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240847.

The product of its (nonzero) digits is 52254720, while the sum is 64.

The spelling of 20499667885 in words is "twenty billion, four hundred ninety-nine million, six hundred sixty-seven thousand, eight hundred eighty-five".