1998020 has 12 divisors (see below), whose sum is σ = 4195884. Its totient is φ = 799200.

The previous prime is 1998019. The next prime is 1998023. The reversal of 1998020 is 208991.

It can be written as a sum of positive squares in 2 ways, for example, as 1459264 + 538756 = 1208^2 + 734^2 .

It is not an unprimeable number, because it can be changed into a prime (1998023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49931 + ... + 49970.

It is an arithmetic number, because the mean of its divisors is an integer number (349657).

2^1998020 is an apocalyptic number.

1998020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1998020 is an abundant number, since it is smaller than the sum of its proper divisors (2197864).

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

1998020 is a wasteful number, since it uses less digits than its factorization.

1998020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99910 (or 99908 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1998020 is about 1413.5133533151. The cubic root of 1998020 is about 125.9505138667.

Subtracting from 1998020 its sum of digits (29), we obtain a palindrome (1997991).

The spelling of 1998020 in words is "one million, nine hundred ninety-eight thousand, twenty".