1990954820 has 12 divisors (see below), whose sum is σ = 4181005164. Its totient is φ = 796381920.

The previous prime is 1990954789. The next prime is 1990954853. The reversal of 1990954820 is 284590991.

It can be written as a sum of positive squares in 2 ways, for example, as 1427177284 + 563777536 = 37778^2 + 23744^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49773851 + ... + 49773890.

It is an arithmetic number, because the mean of its divisors is an integer number (348417097).

Almost surely, 2^1990954820 is an apocalyptic number.

1990954820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990954820 is an abundant number, since it is smaller than the sum of its proper divisors (2190050344).

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

1990954820 is a wasteful number, since it uses less digits than its factorization.

1990954820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99547750 (or 99547748 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 1990954820 is about 44620.1167636303. The cubic root of 1990954820 is about 1258.0188105430.

The spelling of 1990954820 in words is "one billion, nine hundred ninety million, nine hundred fifty-four thousand, eight hundred twenty".