1800198020 has 12 divisors (see below), whose sum is σ = 3780415884. Its totient is φ = 720079200.

The previous prime is 1800198019. The next prime is 1800198047. The reversal of 1800198020 is 208910081.

It can be written as a sum of positive squares in 2 ways, for example, as 375739456 + 1424458564 = 19384^2 + 37742^2 .

It is a super-2 number, since 2×1800198020² = 6481425822423840800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45004931 + ... + 45004970.

It is an arithmetic number, because the mean of its divisors is an integer number (315034657).

Almost surely, 2^1800198020 is an apocalyptic number.

1800198020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1800198020 is an abundant number, since it is smaller than the sum of its proper divisors (1980217864).

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

1800198020 is a wasteful number, since it uses less digits than its factorization.

1800198020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90009910 (or 90009908 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1800198020 is about 42428.7404950937. The cubic root of 1800198020 is about 1216.4850047990.

The spelling of 1800198020 in words is "one billion, eight hundred million, one hundred ninety-eight thousand, twenty".