1980609820 has 48 divisors (see below), whose sum is σ = 5033085120. Its totient is φ = 639120384.

The previous prime is 1980609817. The next prime is 1980609857. The reversal of 1980609820 is 289060891.

It is a happy number.

It is a congruent number.

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, 413715 + ... + 418474.

It is an arithmetic number, because the mean of its divisors is an integer number (104855940).

Almost surely, 2^1980609820 is an apocalyptic number.

1980609820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1980609820 is an abundant number, since it is smaller than the sum of its proper divisors (3052475300).

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

1980609820 is a wasteful number, since it uses less digits than its factorization.

1980609820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832222 (or 832220 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1980609820 is about 44504.0427377109. The cubic root of 1980609820 is about 1255.8361374595.

The spelling of 1980609820 in words is "one billion, nine hundred eighty million, six hundred nine thousand, eight hundred twenty".