1220220345 has 16 divisors (see below), whose sum is σ = 1993893120. Its totient is φ = 636937344.

The previous prime is 1220220343. The next prime is 1220220347. The reversal of 1220220345 is 5430220221.

It is an interprime number because it is at equal distance from previous prime (1220220343) and next prime (1220220347).

It is not a de Polignac number, because 1220220345 - 2¹ = 1220220343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220220341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 864700 + ... + 866109.

It is an arithmetic number, because the mean of its divisors is an integer number (124618320).

Almost surely, 2^1220220345 is an apocalyptic number.

1220220345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220220345 is a deficient number, since it is larger than the sum of its proper divisors (773672775).

1220220345 is a wasteful number, since it uses less digits than its factorization.

1220220345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730864.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 1220220345 is about 34931.6524802363. The cubic root of 1220220345 is about 1068.5940555615.

Adding to 1220220345 its reverse (5430220221), we get a palindrome (6650440566).

The spelling of 1220220345 in words is "one billion, two hundred twenty million, two hundred twenty thousand, three hundred forty-five".