1220323020 has 96 divisors (see below), whose sum is σ = 3911846400. Its totient is φ = 278444544.

The previous prime is 1220323009. The next prime is 1220323031. The reversal of 1220323020 is 203230221.

It is an interprime number because it is at equal distance from previous prime (1220323009) and next prime (1220323031).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274576 + ... + 278984.

It is an arithmetic number, because the mean of its divisors is an integer number (40748400).

Almost surely, 2^1220323020 is an apocalyptic number.

1220323020 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 1220323020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1955923200).

1220323020 is an abundant number, since it is smaller than the sum of its proper divisors (2691523380).

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

1220323020 is a wasteful number, since it uses less digits than its factorization.

1220323020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5087 (or 5085 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 1220323020 is about 34933.1221049594. The cubic root of 1220323020 is about 1068.6240268744.

Adding to 1220323020 its reverse (203230221), we get a palindrome (1423553241).

The spelling of 1220323020 in words is "one billion, two hundred twenty million, three hundred twenty-three thousand, twenty".