2158020 has 72 divisors (see below), whose sum is σ = 6901440. Its totient is φ = 544320.

The previous prime is 2158019. The next prime is 2158027. The reversal of 2158020 is 208512.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2157984 and 2158002.

It is not an unprimeable number, because it can be changed into a prime (2158027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3105 + ... + 3735.

2^2158020 is an apocalyptic number.

2158020 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 2158020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3450720).

2158020 is an abundant number, since it is smaller than the sum of its proper divisors (4743420).

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

2158020 is a wasteful number, since it uses less digits than its factorization.

2158020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2158020 is about 1469.0200815510. The cubic root of 2158020 is about 129.2265713576.

The spelling of 2158020 in words is "two million, one hundred fifty-eight thousand, twenty".