19850220 has 144 divisors (see below), whose sum is σ = 68796000. Its totient is φ = 4589568.

The previous prime is 19850213. The next prime is 19850221. The reversal of 19850220 is 2205891.

It is not an unprimeable number, because it can be changed into a prime (19850221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39531 + ... + 40029.

It is an arithmetic number, because the mean of its divisors is an integer number (477750).

Almost surely, 2^19850220 is an apocalyptic number.

19850220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19850220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34398000).

19850220 is an abundant number, since it is smaller than the sum of its proper divisors (48945780).

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

19850220 is a wasteful number, since it uses less digits than its factorization.

19850220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 19850220 is about 4455.3585714283. The cubic root of 19850220 is about 270.7624539305.

The spelling of 19850220 in words is "nineteen million, eight hundred fifty thousand, two hundred twenty".