203403101240 has 64 divisors (see below), whose sum is σ = 470888177760. Its totient is φ = 79029941760.

The previous prime is 203403101227. The next prime is 203403101243. The reversal of 203403101240 is 42101304302.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203403101243) 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, 15359 + ... + 637998.

Almost surely, 2^203403101240 is an apocalyptic number.

203403101240 is a gapful number since it is divisible by the number (20) 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 203403101240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235444088880).

203403101240 is an abundant number, since it is smaller than the sum of its proper divisors (267485076520).

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

203403101240 is a wasteful number, since it uses less digits than its factorization.

203403101240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653592 (or 653588 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 203403101240 its reverse (42101304302), we get a palindrome (245504405542).

The spelling of 203403101240 in words is "two hundred three billion, four hundred three million, one hundred one thousand, two hundred forty".