205520042 has 64 divisors (see below), whose sum is σ = 409812480. Its totient is φ = 75043584.

The previous prime is 205520027. The next prime is 205520047. The reversal of 205520042 is 240025502.

It is a junction number, because it is equal to n+sod(n) for n = 205519996 and 205520023.

It is not an unprimeable number, because it can be changed into a prime (205520047) 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, 120548 + ... + 122240.

It is an arithmetic number, because the mean of its divisors is an integer number (6403320).

Almost surely, 2^205520042 is an apocalyptic number.

205520042 is a deficient number, since it is larger than the sum of its proper divisors (204292438).

205520042 is a wasteful number, since it uses less digits than its factorization.

205520042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 205520042 is about 14335.9702148128. The cubic root of 205520042 is about 590.1350279861.

Adding to 205520042 its reverse (240025502), we get a palindrome (445545544).

The spelling of 205520042 in words is "two hundred five million, five hundred twenty thousand, forty-two".