204320100440 has 32 divisors (see below), whose sum is σ = 460560714480. Its totient is φ = 81578620032.

The previous prime is 204320100371. The next prime is 204320100461. The reversal of 204320100440 is 44001023402.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4647227 + ... + 4690986.

Almost surely, 2^204320100440 is an apocalyptic number.

204320100440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204320100440 is an abundant number, since it is smaller than the sum of its proper divisors (256240614040).

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

204320100440 is a wasteful number, since it uses less digits than its factorization.

204320100440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9338771 (or 9338767 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 204320100440 its reverse (44001023402), we get a palindrome (248321123842).

The spelling of 204320100440 in words is "two hundred four billion, three hundred twenty million, one hundred thousand, four hundred forty".