1003205540 has 24 divisors (see below), whose sum is σ = 2107617792. Its totient is φ = 401113440.

The previous prime is 1003205537. The next prime is 1003205549. The reversal of 1003205540 is 455023001.

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

It is not an unprimeable number, because it can be changed into a prime (1003205549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45437 + ... + 63803.

It is an arithmetic number, because the mean of its divisors is an integer number (87817408).

Almost surely, 2^1003205540 is an apocalyptic number.

1003205540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1003205540 is an abundant number, since it is smaller than the sum of its proper divisors (1104412252).

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

1003205540 is a wasteful number, since it uses less digits than its factorization.

1003205540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21107 (or 21105 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1003205540 is about 31673.4200868804. The cubic root of 1003205540 is about 1001.0673736415.

Adding to 1003205540 its reverse (455023001), we get a palindrome (1458228541).

The spelling of 1003205540 in words is "one billion, three million, two hundred five thousand, five hundred forty".