1990927920 has 80 divisors (see below), whose sum is σ = 6496727040. Its totient is φ = 502970112.

The previous prime is 1990927879. The next prime is 1990927933. The reversal of 1990927920 is 297290991.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1990927920.

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, 213744 + ... + 222863.

It is an arithmetic number, because the mean of its divisors is an integer number (81209088).

Almost surely, 2^1990927920 is an apocalyptic number.

1990927920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990927920 is an abundant number, since it is smaller than the sum of its proper divisors (4505799120).

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

1990927920 is a wasteful number, since it uses less digits than its factorization.

1990927920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436642 (or 436636 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 48.

The square root of 1990927920 is about 44619.8153290665. The cubic root of 1990927920 is about 1258.0131447760.

The spelling of 1990927920 in words is "one billion, nine hundred ninety million, nine hundred twenty-seven thousand, nine hundred twenty".