9989556020 has 18 divisors (see below), whose sum is σ = 20979006342. Its totient is φ = 3995643616.

The previous prime is 9989556019. The next prime is 9989556041. The reversal of 9989556020 is 206559899.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 29116816 + 9960439204 = 5396^2 + 99802^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 435806 + ... + 458154.

Almost surely, 2^9989556020 is an apocalyptic number.

It is an amenable number.

9989556020 is an abundant number, since it is smaller than the sum of its proper divisors (10989450322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9989556020 is an frugal number, since it uses more digits than its factorization.

9989556020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44707 (or 22356 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 53.

The square root of 9989556020 is about 99947.7664582856. The cubic root of 9989556020 is about 2153.6843996768.

The spelling of 9989556020 in words is "nine billion, nine hundred eighty-nine million, five hundred fifty-six thousand, twenty".