206257005 has 24 divisors (see below), whose sum is σ = 378543672. Its totient is φ = 103532544.

The previous prime is 206257003. The next prime is 206257033. The reversal of 206257005 is 500752602.

It can be written as a sum of positive squares in 4 ways, for example, as 112593321 + 93663684 = 10611^2 + 9678^2 .

It is not a de Polignac number, because 206257005 - 2¹ = 206257003 is a prime.

It is a super-2 number, since 2×206257005² = 85083904223140050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206257005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206257003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134044 + ... + 135573.

It is an arithmetic number, because the mean of its divisors is an integer number (15772653).

Almost surely, 2^206257005 is an apocalyptic number.

It is an amenable number.

206257005 is a deficient number, since it is larger than the sum of its proper divisors (172286667).

206257005 is a wasteful number, since it uses less digits than its factorization.

206257005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269645 (or 269642 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 206257005 is about 14361.6504970703. The cubic root of 206257005 is about 590.8395641023.

The spelling of 206257005 in words is "two hundred six million, two hundred fifty-seven thousand, five".