220640523 has 32 divisors (see below), whose sum is σ = 307307520. Its totient is φ = 140743680.

The previous prime is 220640507. The next prime is 220640543. The reversal of 220640523 is 325046022.

220640523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220640523 - 2⁴ = 220640507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220640493 and 220640502.

It is not an unprimeable number, because it can be changed into a prime (220640543) 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, 1952515 + ... + 1952627.

It is an arithmetic number, because the mean of its divisors is an integer number (9603360).

Almost surely, 2^220640523 is an apocalyptic number.

220640523 is a deficient number, since it is larger than the sum of its proper divisors (86666997).

220640523 is a wasteful number, since it uses less digits than its factorization.

220640523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 220640523 is about 14853.9733068294. The cubic root of 220640523 is about 604.2663721002.

Adding to 220640523 its reverse (325046022), we get a palindrome (545686545).

The spelling of 220640523 in words is "two hundred twenty million, six hundred forty thousand, five hundred twenty-three".