1205403220 has 48 divisors (see below), whose sum is σ = 2901282048. Its totient is φ = 412093440.

The previous prime is 1205403211. The next prime is 1205403223. The reversal of 1205403220 is 223045021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205403223) 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, 37225 + ... + 61615.

It is an arithmetic number, because the mean of its divisors is an integer number (60443376).

Almost surely, 2^1205403220 is an apocalyptic number.

1205403220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205403220 is an abundant number, since it is smaller than the sum of its proper divisors (1695878828).

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

1205403220 is a wasteful number, since it uses less digits than its factorization.

1205403220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24760 (or 24758 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1205403220 is about 34718.9173218290. The cubic root of 1205403220 is about 1064.2511196616.

Adding to 1205403220 its reverse (223045021), we get a palindrome (1428448241).

The spelling of 1205403220 in words is "one billion, two hundred five million, four hundred three thousand, two hundred twenty".