1220720455 has 16 divisors (see below), whose sum is σ = 1549296000. Its totient is φ = 920777760.

The previous prime is 1220720447. The next prime is 1220720467. The reversal of 1220720455 is 5540270221.

It is not a de Polignac number, because 1220720455 - 2³ = 1220720447 is a prime.

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, 10405 + ... + 50494.

It is an arithmetic number, because the mean of its divisors is an integer number (96831000).

Almost surely, 2^1220720455 is an apocalyptic number.

1220720455 is a deficient number, since it is larger than the sum of its proper divisors (328575545).

1220720455 is a wasteful number, since it uses less digits than its factorization.

1220720455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61134.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 1220720455 is about 34938.8101543255. The cubic root of 1220720455 is about 1068.7400241651.

Adding to 1220720455 its reverse (5540270221), we get a palindrome (6760990676).

The spelling of 1220720455 in words is "one billion, two hundred twenty million, seven hundred twenty thousand, four hundred fifty-five".