1320020220 has 96 divisors (see below), whose sum is σ = 3747373056. Its totient is φ = 347155200.

The previous prime is 1320020213. The next prime is 1320020263. The reversal of 1320020220 is 220200231.

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 = 1320020196 and 1320020205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1607410 + ... + 1608230.

It is an arithmetic number, because the mean of its divisors is an integer number (39035136).

Almost surely, 2^1320020220 is an apocalyptic number.

1320020220 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 1320020220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1873686528).

1320020220 is an abundant number, since it is smaller than the sum of its proper divisors (2427352836).

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

1320020220 is a wasteful number, since it uses less digits than its factorization.

1320020220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1169 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 1320020220 is about 36332.0825166959. The cubic root of 1320020220 is about 1096.9669116089.

Adding to 1320020220 its reverse (220200231), we get a palindrome (1540220451).

The spelling of 1320020220 in words is "one billion, three hundred twenty million, twenty thousand, two hundred twenty".