1233205220 has 48 divisors (see below), whose sum is σ = 2809087680. Its totient is φ = 452048256.

The previous prime is 1233205201. The next prime is 1233205229. The reversal of 1233205220 is 225023321.

It is a super-2 number, since 2×1233205220² = 3041590229270496800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1233205192 and 1233205201.

It is not an unprimeable number, because it can be changed into a prime (1233205229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19079 + ... + 53201.

It is an arithmetic number, because the mean of its divisors is an integer number (58522660).

Almost surely, 2^1233205220 is an apocalyptic number.

1233205220 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 1233205220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1404543840).

1233205220 is an abundant number, since it is smaller than the sum of its proper divisors (1575882460).

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

1233205220 is a wasteful number, since it uses less digits than its factorization.

1233205220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34284 (or 34282 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 1233205220 is about 35117.0217985523. The cubic root of 1233205220 is about 1072.3711413078.

Adding to 1233205220 its reverse (225023321), we get a palindrome (1458228541).

The spelling of 1233205220 in words is "one billion, two hundred thirty-three million, two hundred five thousand, two hundred twenty".