220066831 has 4 divisors (see below), whose sum is σ = 224749152. Its totient is φ = 215384512.

The previous prime is 220066823. The next prime is 220066841. The reversal of 220066831 is 138660022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138660022 = 2 ⋅69330011.

It is a cyclic number.

It is not a de Polignac number, because 220066831 - 2³ = 220066823 is a prime.

It is a super-2 number, since 2×220066831² = 96858820212765122, 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 220066831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220066811) 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, 2341090 + ... + 2341183.

It is an arithmetic number, because the mean of its divisors is an integer number (56187288).

Almost surely, 2^220066831 is an apocalyptic number.

220066831 is a deficient number, since it is larger than the sum of its proper divisors (4682321).

220066831 is an equidigital number, since it uses as much as digits as its factorization.

220066831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682320.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 220066831 is about 14834.6496756749. The cubic root of 220066831 is about 603.7421956877.

The spelling of 220066831 in words is "two hundred twenty million, sixty-six thousand, eight hundred thirty-one".