20356489899 has 6 divisors (see below), whose sum is σ = 29403818756. Its totient is φ = 13570993260.

The previous prime is 20356489897. The next prime is 20356489903. The reversal of 20356489899 is 99898465302.

20356489899 is a `hidden beast` number, since 20 + 3 + 56 + 489 + 89 + 9 = 666.

It is not a de Polignac number, because 20356489899 - 2¹ = 20356489897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20356489897) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1130916097 + ... + 1130916114.

Almost surely, 2^20356489899 is an apocalyptic number.

20356489899 is a deficient number, since it is larger than the sum of its proper divisors (9047328857).

20356489899 is a wasteful number, since it uses less digits than its factorization.

20356489899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261832217 (or 2261832214 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 20356489899 in words is "twenty billion, three hundred fifty-six million, four hundred eighty-nine thousand, eight hundred ninety-nine".