1320203100 has 72 divisors (see below), whose sum is σ = 3849975808. Its totient is φ = 349272000.

The previous prime is 1320203083. The next prime is 1320203111. The reversal of 1320203100 is 13020231.

It is a happy number.

It is a super-2 number, since 2×1320203100² = 3485872450499220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 20775 + ... + 55425.

Almost surely, 2^1320203100 is an apocalyptic number.

1320203100 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 1320203100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1924987904).

1320203100 is an abundant number, since it is smaller than the sum of its proper divisors (2529772708).

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

1320203100 is a wasteful number, since it uses less digits than its factorization.

1320203100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34795 (or 34788 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1320203100 is about 36334.5992134219. The cubic root of 1320203100 is about 1097.0175684200.

Adding to 1320203100 its reverse (13020231), we get a palindrome (1333223331).

The spelling of 1320203100 in words is "one billion, three hundred twenty million, two hundred three thousand, one hundred".