99880020 has 96 divisors (see below), whose sum is σ = 319200000. Its totient is φ = 25909632.

The previous prime is 99880019. The next prime is 99880021. The reversal of 99880020 is 2008899.

It is an interprime number because it is at equal distance from previous prime (99880019) and next prime (99880021).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99880021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17481 + ... + 22479.

It is an arithmetic number, because the mean of its divisors is an integer number (3325000).

Almost surely, 2^99880020 is an apocalyptic number.

99880020 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99880020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159600000).

99880020 is an abundant number, since it is smaller than the sum of its proper divisors (219319980).

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

99880020 is a wasteful number, since it uses less digits than its factorization.

99880020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5054 (or 5046 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 99880020 is about 9993.9991995197. Note that the first 3 decimals coincide. The cubic root of 99880020 is about 463.9731764617.

It can be divided in two parts, 998 and 80020, that added together give a palindrome (81018).

The spelling of 99880020 in words is "ninety-nine million, eight hundred eighty thousand, twenty".