19928290 has 16 divisors (see below), whose sum is σ = 36024120. Its totient is φ = 7937280.

The previous prime is 19928287. The next prime is 19928297. The reversal of 19928290 is 9282991.

It can be written as a sum of positive squares in 4 ways, for example, as 19793601 + 134689 = 4449^2 + 367^2 .

It is not an unprimeable number, because it can be changed into a prime (19928297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1725 + ... + 6544.

Almost surely, 2^19928290 is an apocalyptic number.

19928290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19928290 is a deficient number, since it is larger than the sum of its proper divisors (16095830).

19928290 is a wasteful number, since it uses less digits than its factorization.

19928290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8517.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19928290 is about 4464.1113337371. Note that the first 3 decimals coincide. The cubic root of 19928290 is about 271.1169550061.

The spelling of 19928290 in words is "nineteen million, nine hundred twenty-eight thousand, two hundred ninety".