990198020 has 48 divisors (see below), whose sum is σ = 2378315520. Its totient is φ = 339233664.

The previous prime is 990198007. The next prime is 990198029. The reversal of 990198020 is 20891099.

It is not an unprimeable number, because it can be changed into a prime (990198029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290486 + ... + 293874.

It is an arithmetic number, because the mean of its divisors is an integer number (49548240).

Almost surely, 2^990198020 is an apocalyptic number.

It is an amenable number.

990198020 is an abundant number, since it is smaller than the sum of its proper divisors (1388117500).

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

990198020 is a wasteful number, since it uses less digits than its factorization.

990198020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5492 (or 5490 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 990198020 is about 31467.4120321325. The cubic root of 990198020 is about 996.7219393937.

The spelling of 990198020 in words is "nine hundred ninety million, one hundred ninety-eight thousand, twenty".