204631897531520 has 128 divisors (see below), whose sum is σ = 515221271553600. Its totient is φ = 77503176069120.

The previous prime is 204631897531513. The next prime is 204631897531531. The reversal of 204631897531520 is 25135798136402.

It is a tau number, because it is divible by the number of its divisors (128).

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, 18195950 + ... + 27209490.

It is a 1-persistent number, because it is pandigital, but 2⋅204631897531520 = 409263795063040 is not.

Almost surely, 2^{204631897531520} is an apocalyptic number.

204631897531520 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 204631897531520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257610635776800).

204631897531520 is an abundant number, since it is smaller than the sum of its proper divisors (310589374022080).

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

204631897531520 is a wasteful number, since it uses less digits than its factorization.

204631897531520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9015446 (or 9015434 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 56.

The spelling of 204631897531520 in words is "two hundred four trillion, six hundred thirty-one billion, eight hundred ninety-seven million, five hundred thirty-one thousand, five hundred twenty".