1908394020 has 120 divisors (see below), whose sum is σ = 6447289464. Its totient is φ = 469753344.

The previous prime is 1908394009. The next prime is 1908394043. The reversal of 1908394020 is 204938091.

It can be written as a sum of positive squares in 4 ways, for example, as 448084224 + 1460309796 = 21168^2 + 38214^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 24249 + ... + 66368.

Almost surely, 2^1908394020 is an apocalyptic number.

1908394020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1908394020 is an abundant number, since it is smaller than the sum of its proper divisors (4538895444).

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

1908394020 is a wasteful number, since it uses less digits than its factorization.

1908394020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90651 (or 90640 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1908394020 is about 43685.1693369729. The cubic root of 1908394020 is about 1240.3836005350.

The spelling of 1908394020 in words is "one billion, nine hundred eight million, three hundred ninety-four thousand, twenty".