205687131342 has 96 divisors (see below), whose sum is σ = 544738431744. Its totient is φ = 51102374400.

The previous prime is 205687131317. The next prime is 205687131359. The reversal of 205687131342 is 243131786502.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 205687131294 and 205687131303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1308259 + ... + 1457022.

It is an arithmetic number, because the mean of its divisors is an integer number (5674358664).

Almost surely, 2^205687131342 is an apocalyptic number.

205687131342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

205687131342 is an abundant number, since it is smaller than the sum of its proper divisors (339051300402).

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

205687131342 is a wasteful number, since it uses less digits than its factorization.

205687131342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765334 (or 2765327 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 205687131342 in words is "two hundred five billion, six hundred eighty-seven million, one hundred thirty-one thousand, three hundred forty-two".