204697379840 has 176 divisors, whose sum is σ = 518166771840. Its totient is φ = 77435043840.

The previous prime is 204697379827. The next prime is 204697379851. The reversal of 204697379840 is 48973796402.

It is a super-2 number, since 2×204697379840² (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 204697379840.

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, 10470875 + ... + 10490405.

Almost surely, 2^204697379840 is an apocalyptic number.

204697379840 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 204697379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259083385920).

204697379840 is an abundant number, since it is smaller than the sum of its proper divisors (313469392000).

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

204697379840 is a wasteful number, since it uses less digits than its factorization.

204697379840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19668 (or 19650 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 59.

The spelling of 204697379840 in words is "two hundred four billion, six hundred ninety-seven million, three hundred seventy-nine thousand, eight hundred forty".