1810020 has 48 divisors (see below), whose sum is σ = 5136768. Its totient is φ = 476160.

The previous prime is 1810013. The next prime is 1810033. The reversal of 1810020 is 200181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1809978 and 1810005.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5665 + ... + 5975.

It is an arithmetic number, because the mean of its divisors is an integer number (107016).

2^1810020 is an apocalyptic number.

1810020 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 1810020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2568384).

1810020 is an abundant number, since it is smaller than the sum of its proper divisors (3326748).

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

1810020 is a wasteful number, since it uses less digits than its factorization.

1810020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1810020 is about 1345.3698376283. The cubic root of 1810020 is about 121.8693396451.

The spelling of 1810020 in words is "one million, eight hundred ten thousand, twenty".