204890806431 has 12 divisors (see below), whose sum is σ = 303952127752. Its totient is φ = 132902144496.

The previous prime is 204890806429. The next prime is 204890806433. The reversal of 204890806431 is 134608098402.

It is a happy number.

204890806431 is a `hidden beast` number, since 2 + 0 + 489 + 0 + 80 + 64 + 31 = 666.

It is an interprime number because it is at equal distance from previous prime (204890806429) and next prime (204890806433).

It is not a de Polignac number, because 204890806431 - 2¹ = 204890806429 is a prime.

It is a super-2 number, since 2×204890806431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204890806433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307643521 + ... + 307644186.

Almost surely, 2^204890806431 is an apocalyptic number.

204890806431 is a deficient number, since it is larger than the sum of its proper divisors (99061321321).

204890806431 is a wasteful number, since it uses less digits than its factorization.

204890806431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615287750 (or 615287747 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 204890806431 in words is "two hundred four billion, eight hundred ninety million, eight hundred six thousand, four hundred thirty-one".