1220545332 has 72 divisors (see below), whose sum is σ = 3257304960. Its totient is φ = 385357392.

The previous prime is 1220545297. The next prime is 1220545343. The reversal of 1220545332 is 2335450221.

It is a happy number.

1220545332 is a `hidden beast` number, since 1 + 2 + 205 + 453 + 3 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1220545296 and 1220545305.

It is a congruent number.

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, 244453 + ... + 249395.

Almost surely, 2^1220545332 is an apocalyptic number.

1220545332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220545332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1628652480).

1220545332 is an abundant number, since it is smaller than the sum of its proper divisors (2036759628).

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

1220545332 is a wasteful number, since it uses less digits than its factorization.

1220545332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010 (or 4967 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 1220545332 is about 34936.3039258591. The cubic root of 1220545332 is about 1068.6889150272.

Adding to 1220545332 its reverse (2335450221), we get a palindrome (3555995553).

The spelling of 1220545332 in words is "one billion, two hundred twenty million, five hundred forty-five thousand, three hundred thirty-two".