1321020 has 72 divisors (see below), whose sum is σ = 4127760. Its totient is φ = 341760.

The previous prime is 1321007. The next prime is 1321031. The reversal of 1321020 is 201231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1320993 and 1321011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7291 + ... + 7469.

It is an arithmetic number, because the mean of its divisors is an integer number (57330).

2^1321020 is an apocalyptic number.

1321020 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 1321020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2063880).

1321020 is an abundant number, since it is smaller than the sum of its proper divisors (2806740).

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

1321020 is a wasteful number, since it uses less digits than its factorization.

1321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1321020 is about 1149.3563416104. The cubic root of 1321020 is about 109.7243788380.

Adding to 1321020 its reverse (201231), we get a palindrome (1522251).

The spelling of 1321020 in words is "one million, three hundred twenty-one thousand, twenty".