220520523 has 4 divisors (see below), whose sum is σ = 294027368. Its totient is φ = 147013680.

The previous prime is 220520519. The next prime is 220520539. The reversal of 220520523 is 325025022.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 220520523 - 2² = 220520519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220520523.

It is not an unprimeable number, because it can be changed into a prime (220520563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36753418 + ... + 36753423.

It is an arithmetic number, because the mean of its divisors is an integer number (73506842).

Almost surely, 2^220520523 is an apocalyptic number.

220520523 is a deficient number, since it is larger than the sum of its proper divisors (73506845).

220520523 is an equidigital number, since it uses as much as digits as its factorization.

220520523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73506844.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 220520523 is about 14849.9334341942. The cubic root of 220520523 is about 604.1568045657.

Adding to 220520523 its reverse (325025022), we get a palindrome (545545545).

The spelling of 220520523 in words is "two hundred twenty million, five hundred twenty thousand, five hundred twenty-three".