204020133440 has 224 divisors, whose sum is σ = 551705800320. Its totient is φ = 71390232576.

The previous prime is 204020133439. The next prime is 204020133463. The reversal of 204020133440 is 44331020402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5459459 + ... + 5496701.

Almost surely, 2^204020133440 is an apocalyptic number.

204020133440 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 204020133440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275852900160).

204020133440 is an abundant number, since it is smaller than the sum of its proper divisors (347685666880).

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

204020133440 is a wasteful number, since it uses less digits than its factorization.

204020133440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37349 (or 37339 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 204020133440 its reverse (44331020402), we get a palindrome (248351153842).

The spelling of 204020133440 in words is "two hundred four billion, twenty million, one hundred thirty-three thousand, four hundred forty".