9999100020 has 192 divisors, whose sum is σ = 34524274176. Its totient is φ = 2105671680.

The previous prime is 9999100009. The next prime is 9999100051. The reversal of 9999100020 is 200019999.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3498432 + ... + 3501288.

It is an arithmetic number, because the mean of its divisors is an integer number (179813928).

Almost surely, 2^9999100020 is an apocalyptic number.

It is a pronic number, being equal to 99995×99996.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17262137088).

9999100020 is an abundant number, since it is smaller than the sum of its proper divisors (24525174156).

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

9999100020 is a wasteful number, since it uses less digits than its factorization.

9999100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3530 (or 3528 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 9999100020 is about 99995.4999987499. The cubic root of 9999100020 is about 2154.3700564885.

It can be divided in two parts, 999 and 9100020, that added together give a palindrome (9101019).

The spelling of 9999100020 in words is "nine billion, nine hundred ninety-nine million, one hundred thousand, twenty".