19802220 has 24 divisors (see below), whose sum is σ = 55446384. Its totient is φ = 5280576.

The previous prime is 19802213. The next prime is 19802257. The reversal of 19802220 is 2220891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164959 + ... + 165078.

It is an arithmetic number, because the mean of its divisors is an integer number (2310266).

Almost surely, 2^19802220 is an apocalyptic number.

19802220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19802220 is an abundant number, since it is smaller than the sum of its proper divisors (35644164).

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

19802220 is a wasteful number, since it uses less digits than its factorization.

19802220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330049 (or 330047 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 19802220 is about 4449.9685392146. The cubic root of 19802220 is about 270.5440333855.

The spelling of 19802220 in words is "nineteen million, eight hundred two thousand, two hundred twenty".