1220420323 has 4 divisors (see below), whose sum is σ = 1232269168. Its totient is φ = 1208571480.

The previous prime is 1220420317. The next prime is 1220420329. The reversal of 1220420323 is 3230240221.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1220420317) and next prime (1220420329).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220420323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220420323.

It is not an unprimeable number, because it can be changed into a prime (1220420329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5924268 + ... + 5924473.

It is an arithmetic number, because the mean of its divisors is an integer number (308067292).

Almost surely, 2^1220420323 is an apocalyptic number.

1220420323 is a deficient number, since it is larger than the sum of its proper divisors (11848845).

1220420323 is a wasteful number, since it uses less digits than its factorization.

1220420323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11848844.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 1220420323 is about 34934.5147812303. The cubic root of 1220420323 is about 1068.6524285239.

Adding to 1220420323 its reverse (3230240221), we get a palindrome (4450660544).

The spelling of 1220420323 in words is "one billion, two hundred twenty million, four hundred twenty thousand, three hundred twenty-three".