1217660220 has 216 divisors, whose sum is σ = 4456749024. Its totient is φ = 263575296.

The previous prime is 1217660219. The next prime is 1217660233. The reversal of 1217660220 is 220667121.

It is a super-2 number, since 2×1217660220² = 2965392822740896800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 453522 + ... + 456198.

Almost surely, 2^1217660220 is an apocalyptic number.

1217660220 is a gapful number since it is divisible by the number (10) 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 1217660220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2228374512).

1217660220 is an abundant number, since it is smaller than the sum of its proper divisors (3239088804).

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

1217660220 is a wasteful number, since it uses less digits than its factorization.

1217660220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737 (or 2713 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1217660220 is about 34894.9884653943. The cubic root of 1217660220 is about 1067.8461988683.

The spelling of 1217660220 in words is "one billion, two hundred seventeen million, six hundred sixty thousand, two hundred twenty".