1980199820 has 12 divisors (see below), whose sum is σ = 4158419664. Its totient is φ = 792079920.

The previous prime is 1980199801. The next prime is 1980199829. The reversal of 1980199820 is 289910891.

It is not an unprimeable number, because it can be changed into a prime (1980199829) 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, 49504976 + ... + 49505015.

It is an arithmetic number, because the mean of its divisors is an integer number (346534972).

Almost surely, 2^1980199820 is an apocalyptic number.

1980199820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980199820 is an abundant number, since it is smaller than the sum of its proper divisors (2178219844).

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

1980199820 is a wasteful number, since it uses less digits than its factorization.

1980199820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99010000 (or 99009998 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 47.

The square root of 1980199820 is about 44499.4361762034. The cubic root of 1980199820 is about 1255.7494758761.

The spelling of 1980199820 in words is "one billion, nine hundred eighty million, one hundred ninety-nine thousand, eight hundred twenty".