1981767020 has 12 divisors (see below), whose sum is σ = 4161710784. Its totient is φ = 792706800.

The previous prime is 1981767001. The next prime is 1981767037. The reversal of 1981767020 is 207671891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49544156 + ... + 49544195.

It is an arithmetic number, because the mean of its divisors is an integer number (346809232).

Almost surely, 2^1981767020 is an apocalyptic number.

1981767020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1981767020 is an abundant number, since it is smaller than the sum of its proper divisors (2179943764).

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

1981767020 is a wasteful number, since it uses less digits than its factorization.

1981767020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99088360 (or 99088358 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 1981767020 is about 44517.0419053198. The cubic root of 1981767020 is about 1256.0806699982.

The spelling of 1981767020 in words is "one billion, nine hundred eighty-one million, seven hundred sixty-seven thousand, twenty".