220355531 has 4 divisors (see below), whose sum is σ = 240387864. Its totient is φ = 200323200.

The previous prime is 220355507. The next prime is 220355549. The reversal of 220355531 is 135553022.

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

It is not a de Polignac number, because 220355531 - 2²² = 216161227 is a prime.

It is a super-2 number, since 2×220355531² = 97113120084583922, which contains 22 as substring.

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 220355531.

It is not an unprimeable number, because it can be changed into a prime (220355591) 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, 10016150 + ... + 10016171.

It is an arithmetic number, because the mean of its divisors is an integer number (60096966).

Almost surely, 2^220355531 is an apocalyptic number.

220355531 is a deficient number, since it is larger than the sum of its proper divisors (20032333).

220355531 is a wasteful number, since it uses less digits than its factorization.

220355531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20032332.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 220355531 is about 14844.3770835963. The cubic root of 220355531 is about 604.0060915939.

The spelling of 220355531 in words is "two hundred twenty million, three hundred fifty-five thousand, five hundred thirty-one".