204340400340 has 48 divisors (see below), whose sum is σ = 572193901440. Its totient is φ = 54486889600.

The previous prime is 204340400317. The next prime is 204340400393. The reversal of 204340400340 is 43004043402.

It is a happy number.

It is a super-2 number, since 2×204340400340² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 204340400340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 783166 + ... + 1010954.

It is an arithmetic number, because the mean of its divisors is an integer number (11920706280).

Almost surely, 2^204340400340 is an apocalyptic number.

204340400340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204340400340 is an abundant number, since it is smaller than the sum of its proper divisors (367853501100).

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

204340400340 is a wasteful number, since it uses less digits than its factorization.

204340400340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242752 (or 242750 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

Adding to 204340400340 its reverse (43004043402), we get a palindrome (247344443742).

The spelling of 204340400340 in words is "two hundred four billion, three hundred forty million, four hundred thousand, three hundred forty".