205023069 has 20 divisors (see below), whose sum is σ = 316833660. Its totient is φ = 131967360.

The previous prime is 205023059. The next prime is 205023073. The reversal of 205023069 is 960320502.

It can be written as a sum of positive squares in 2 ways, for example, as 168662169 + 36360900 = 12987^2 + 6030^2 .

It is not a de Polignac number, because 205023069 - 2¹¹ = 205021021 is a prime.

It is a super-2 number, since 2×205023069² = 84068917644357522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205023059) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41292 + ... + 45989.

It is an arithmetic number, because the mean of its divisors is an integer number (15841683).

Almost surely, 2^205023069 is an apocalyptic number.

205023069 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

205023069 is a deficient number, since it is larger than the sum of its proper divisors (111810591).

205023069 is an equidigital number, since it uses as much as digits as its factorization.

205023069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87322 (or 87313 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 205023069 is about 14318.6266450383. The cubic root of 205023069 is about 589.6589707814.

The spelling of 205023069 in words is "two hundred five million, twenty-three thousand, sixty-nine".