17990920 has 16 divisors (see below), whose sum is σ = 40479660. Its totient is φ = 7196352.

The previous prime is 17990897. The next prime is 17990939. The reversal of 17990920 is 2909971.

It can be written as a sum of positive squares in 2 ways, for example, as 17960644 + 30276 = 4238^2 + 174^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 17990920.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224847 + ... + 224926.

Almost surely, 2^17990920 is an apocalyptic number.

17990920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17990920 is an abundant number, since it is smaller than the sum of its proper divisors (22488740).

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

17990920 is a wasteful number, since it uses less digits than its factorization.

17990920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449784 (or 449780 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 17990920 is about 4241.5704638730. The cubic root of 17990920 is about 262.0300647278.

The spelling of 17990920 in words is "seventeen million, nine hundred ninety thousand, nine hundred twenty".