2891020 has 48 divisors (see below), whose sum is σ = 7021728. Its totient is φ = 988160.

The previous prime is 2891011. The next prime is 2891023. The reversal of 2891020 is 201982.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 2890982 and 2891000.

It is not an unprimeable number, because it can be changed into a prime (2891023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3354 + ... + 4126.

It is an arithmetic number, because the mean of its divisors is an integer number (146286).

2^2891020 is an apocalyptic number.

2891020 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 2891020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3510864).

2891020 is an abundant number, since it is smaller than the sum of its proper divisors (4130708).

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

2891020 is a wasteful number, since it uses less digits than its factorization.

2891020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2891020 is about 1700.2999735341. The cubic root of 2891020 is about 142.4569686423.

The spelling of 2891020 in words is "two million, eight hundred ninety-one thousand, twenty".