1331806220 has 12 divisors (see below), whose sum is σ = 2796793104. Its totient is φ = 532722480.

The previous prime is 1331806219. The next prime is 1331806243. The reversal of 1331806220 is 226081331.

It is a self number, because there is not a number n which added to its sum of digits gives 1331806220.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33295136 + ... + 33295175.

It is an arithmetic number, because the mean of its divisors is an integer number (233066092).

Almost surely, 2^1331806220 is an apocalyptic number.

1331806220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331806220 is an abundant number, since it is smaller than the sum of its proper divisors (1464986884).

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

1331806220 is a wasteful number, since it uses less digits than its factorization.

1331806220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66590320 (or 66590318 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1331806220 is about 36493.9203155813. The cubic root of 1331806220 is about 1100.2220543450. Note that the first 3 decimals are identical.

Adding to 1331806220 its reverse (226081331), we get a palindrome (1557887551).

The spelling of 1331806220 in words is "one billion, three hundred thirty-one million, eight hundred six thousand, two hundred twenty".