1220204505 has 24 divisors (see below), whose sum is σ = 2114062848. Its totient is φ = 600714816.

The previous prime is 1220204473. The next prime is 1220204527. The reversal of 1220204505 is 5054020221.

It is a happy number.

It is not a de Polignac number, because 1220204505 - 2⁵ = 1220204473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238137 + ... + 243206.

It is an arithmetic number, because the mean of its divisors is an integer number (88085952).

Almost surely, 2^1220204505 is an apocalyptic number.

1220204505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220204505 is a deficient number, since it is larger than the sum of its proper divisors (893858343).

1220204505 is a wasteful number, since it uses less digits than its factorization.

1220204505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481377 (or 481364 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1220204505 is about 34931.4257510340. The cubic root of 1220204505 is about 1068.5894316417.

Adding to 1220204505 its reverse (5054020221), we get a palindrome (6274224726).

The spelling of 1220204505 in words is "one billion, two hundred twenty million, two hundred four thousand, five hundred five".