1320220 has 48 divisors (see below), whose sum is σ = 3211488. Its totient is φ = 450560.

The previous prime is 1320211. The next prime is 1320247. The reversal of 1320220 is 220231.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1320197 and 1320206.

It is a congruent number.

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, 3564 + ... + 3916.

It is an arithmetic number, because the mean of its divisors is an integer number (66906).

2^1320220 is an apocalyptic number.

1320220 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 1320220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1605744).

1320220 is an abundant number, since it is smaller than the sum of its proper divisors (1891268).

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

1320220 is a wasteful number, since it uses less digits than its factorization.

1320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 1320220 is about 1149.0082680294. The cubic root of 1320220 is about 109.7022249396.

Adding to 1320220 its reverse (220231), we get a palindrome (1540451).

It can be divided in two parts, 1320 and 220, that added together give a triangular number (1540 = T₅₅).

The spelling of 1320220 in words is "one million, three hundred twenty thousand, two hundred twenty".