1980398020 has 48 divisors (see below), whose sum is σ = 4247007408. Its totient is φ = 775526400.

The previous prime is 1980397997. The next prime is 1980398033. The reversal of 1980398020 is 208930891.

It can be written as a sum of positive squares in 8 ways, for example, as 171767236 + 1808630784 = 13106^2 + 42528^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195070 + ... + 204970.

It is an arithmetic number, because the mean of its divisors is an integer number (88479321).

Almost surely, 2^1980398020 is an apocalyptic number.

1980398020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980398020 is an abundant number, since it is smaller than the sum of its proper divisors (2266609388).

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

1980398020 is a wasteful number, since it uses less digits than its factorization.

1980398020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10120 (or 10118 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1980398020 is about 44501.6631149893. The cubic root of 1980398020 is about 1255.7913708472.

The spelling of 1980398020 in words is "one billion, nine hundred eighty million, three hundred ninety-eight thousand, twenty".