206040731 has 16 divisors (see below), whose sum is σ = 247312800. Its totient is φ = 169579008.

The previous prime is 206040727. The next prime is 206040749. The reversal of 206040731 is 137040602.

It is a cyclic number.

It is not a de Polignac number, because 206040731 - 2² = 206040727 is a prime.

It is a super-2 number, since 2×206040731² = 84905565662028722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206040697 and 206040706.

It is not an unprimeable number, because it can be changed into a prime (206040761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20336 + ... + 28733.

It is an arithmetic number, because the mean of its divisors is an integer number (15457050).

Almost surely, 2^206040731 is an apocalyptic number.

206040731 is a deficient number, since it is larger than the sum of its proper divisors (41272069).

206040731 is a wasteful number, since it uses less digits than its factorization.

206040731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49118.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 206040731 is about 14354.1189558956. The cubic root of 206040731 is about 590.6329805329.

The spelling of 206040731 in words is "two hundred six million, forty thousand, seven hundred thirty-one".