1220432220 has 108 divisors (see below), whose sum is σ = 4306413384. Its totient is φ = 278953920.

The previous prime is 1220432209. The next prime is 1220432231. The reversal of 1220432220 is 222340221.

1220432220 is a `hidden beast` number, since 12 + 2 + 0 + 432 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (1220432209) and next prime (1220432231).

It is a super-3 number, since 3×1220432220³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1220432193 and 1220432202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60366 + ... + 78005.

It is an arithmetic number, because the mean of its divisors is an integer number (39874198).

Almost surely, 2^1220432220 is an apocalyptic number.

1220432220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220432220 is an abundant number, since it is smaller than the sum of its proper divisors (3085981164).

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

1220432220 is a wasteful number, since it uses less digits than its factorization.

1220432220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138400 (or 138388 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1220432220 is about 34934.6850565452. The cubic root of 1220432220 is about 1068.6559010206.

Adding to 1220432220 its reverse (222340221), we get a palindrome (1442772441).

The spelling of 1220432220 in words is "one billion, two hundred twenty million, four hundred thirty-two thousand, two hundred twenty".