220790881 has 4 divisors (see below), whose sum is σ = 220821700. Its totient is φ = 220760064.

The previous prime is 220790861. The next prime is 220790923. The reversal of 220790881 is 188097022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 30902481 + 189888400 = 5559^2 + 13780^2 .

It is a cyclic number.

It is not a de Polignac number, because 220790881 - 2⁷ = 220790753 is a prime.

It is a super-2 number, since 2×220790881² = 97497226265512322, 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 220790881.

It is not an unprimeable number, because it can be changed into a prime (220790821) 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, 1585 + ... + 21073.

It is an arithmetic number, because the mean of its divisors is an integer number (55205425).

Almost surely, 2^220790881 is an apocalyptic number.

It is an amenable number.

220790881 is a deficient number, since it is larger than the sum of its proper divisors (30819).

220790881 is a wasteful number, since it uses less digits than its factorization.

220790881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30818.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 220790881 is about 14859.0336496018. The cubic root of 220790881 is about 604.4036023354.

The spelling of 220790881 in words is "two hundred twenty million, seven hundred ninety thousand, eight hundred eighty-one".