2158220 has 36 divisors (see below), whose sum is σ = 4759104. Its totient is φ = 821280.

The previous prime is 2158183. The next prime is 2158223. The reversal of 2158220 is 228512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 2158192 and 2158201.

It is not an unprimeable number, because it can be changed into a prime (2158223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36551 + ... + 36609.

2^2158220 is an apocalyptic number.

2158220 is a gapful number since it is divisible by the number (20) 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 2158220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2379552).

2158220 is an abundant number, since it is smaller than the sum of its proper divisors (2600884).

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

2158220 is a wasteful number, since it uses less digits than its factorization.

2158220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2158220 is about 1469.0881525627. The cubic root of 2158220 is about 129.2305633682.

The spelling of 2158220 in words is "two million, one hundred fifty-eight thousand, two hundred twenty".