205731342 has 24 divisors (see below), whose sum is σ = 446518800. Its totient is φ = 68459040.

The previous prime is 205731341. The next prime is 205731347. The reversal of 205731342 is 243137502.

It is a super-2 number, since 2×205731342² = 84650770162241928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205731341) 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, 1242 + ... + 20322.

It is an arithmetic number, because the mean of its divisors is an integer number (18604950).

Almost surely, 2^205731342 is an apocalyptic number.

205731342 is an abundant number, since it is smaller than the sum of its proper divisors (240787458).

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

205731342 is a wasteful number, since it uses less digits than its factorization.

205731342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19688 (or 19685 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 205731342 is about 14343.3378960408. The cubic root of 205731342 is about 590.3372026264.

Adding to 205731342 its reverse (243137502), we get a palindrome (448868844).

The spelling of 205731342 in words is "two hundred five million, seven hundred thirty-one thousand, three hundred forty-two".