204537690 has 128 divisors (see below), whose sum is σ = 643645440. Its totient is φ = 45230400.

The previous prime is 204537661. The next prime is 204537743. The reversal of 204537690 is 96735402.

It is a super-2 number, since 2×204537690² = 83671333261072200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56845 + ... + 60335.

It is an arithmetic number, because the mean of its divisors is an integer number (5028480).

Almost surely, 2^204537690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204537690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321822720).

204537690 is an abundant number, since it is smaller than the sum of its proper divisors (439107750).

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

204537690 is a wasteful number, since it uses less digits than its factorization.

204537690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545 (or 3539 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 204537690 is about 14301.6673853086. The cubic root of 204537690 is about 589.1932764569.

The spelling of 204537690 in words is "two hundred four million, five hundred thirty-seven thousand, six hundred ninety".