204520144505 has 16 divisors (see below), whose sum is σ = 247379958144. Its totient is φ = 162317425920.

The previous prime is 204520144483. The next prime is 204520144537. The reversal of 204520144505 is 505441025402.

It is a de Polignac number, because none of the positive numbers 2^k-204520144505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5759 + ... + 639588.

It is an arithmetic number, because the mean of its divisors is an integer number (15461247384).

Almost surely, 2^204520144505 is an apocalyptic number.

It is an amenable number.

204520144505 is a deficient number, since it is larger than the sum of its proper divisors (42859813639).

204520144505 is a wasteful number, since it uses less digits than its factorization.

204520144505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645856.

The product of its (nonzero) digits is 32000, while the sum is 32.

Adding to 204520144505 its reverse (505441025402), we get a palindrome (709961169907).

The spelling of 204520144505 in words is "two hundred four billion, five hundred twenty million, one hundred forty-four thousand, five hundred five".