20843190 has 128 divisors (see below), whose sum is σ = 62208000. Its totient is φ = 4935168.

The previous prime is 20843161. The next prime is 20843197. The reversal of 20843190 is 9134802.

It is a super-2 number, since 2×20843190² = 868877138752200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20843197) 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 63 ways as a sum of consecutive naturals, for example, 87091 + ... + 87329.

It is an arithmetic number, because the mean of its divisors is an integer number (486000).

Almost surely, 2^20843190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20843190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31104000).

20843190 is an abundant number, since it is smaller than the sum of its proper divisors (41364810).

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

20843190 is a wasteful number, since it uses less digits than its factorization.

20843190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20843190 is about 4565.4342619295. The cubic root of 20843190 is about 275.2039918944.

Adding to 20843190 its reverse (9134802), we get a palindrome (29977992).

The spelling of 20843190 in words is "twenty million, eight hundred forty-three thousand, one hundred ninety".