205520245 has 32 divisors (see below), whose sum is σ = 306950400. Its totient is φ = 128894976.

The previous prime is 205520243. The next prime is 205520269. The reversal of 205520245 is 542025502.

It is a happy number.

It is not a de Polignac number, because 205520245 - 2¹ = 205520243 is a prime.

It is a super-2 number, since 2×205520245² = 84477142209720050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205520243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13957 + ... + 24613.

It is an arithmetic number, because the mean of its divisors is an integer number (9592200).

Almost surely, 2^205520245 is an apocalyptic number.

It is an amenable number.

205520245 is a deficient number, since it is larger than the sum of its proper divisors (101430155).

205520245 is a wasteful number, since it uses less digits than its factorization.

205520245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10717.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 205520245 is about 14335.9772949039. The cubic root of 205520245 is about 590.1352222857.

Adding to 205520245 its reverse (542025502), we get a palindrome (747545747).

The spelling of 205520245 in words is "two hundred five million, five hundred twenty thousand, two hundred forty-five".