17220990 has 16 divisors (see below), whose sum is σ = 41330448. Its totient is φ = 4592256.

The previous prime is 17220967. The next prime is 17220991. The reversal of 17220990 is 9902271.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 574033 = 17220990 / (1 + 7 + 2 + 2 + 0 + 9 + 9 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17220991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286987 + ... + 287046.

It is an arithmetic number, because the mean of its divisors is an integer number (2583153).

Almost surely, 2^17220990 is an apocalyptic number.

17220990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

17220990 is an abundant number, since it is smaller than the sum of its proper divisors (24109458).

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

17220990 is a wasteful number, since it uses less digits than its factorization.

17220990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574043.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 17220990 is about 4149.8180683013. The cubic root of 17220990 is about 258.2375373796.

The spelling of 17220990 in words is "seventeen million, two hundred twenty thousand, nine hundred ninety".