22020805 has 4 divisors (see below), whose sum is σ = 26424972. Its totient is φ = 17616640.

The previous prime is 22020793. The next prime is 22020833. The reversal of 22020805 is 50802022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50802022 = 2 ⋅25401011.

It can be written as a sum of positive squares in 2 ways, for example, as 12047841 + 9972964 = 3471^2 + 3158^2 .

It is not a de Polignac number, because 22020805 - 2⁹ = 22020293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202076 + ... + 2202085.

It is an arithmetic number, because the mean of its divisors is an integer number (6606243).

Almost surely, 2^22020805 is an apocalyptic number.

It is an amenable number.

22020805 is a deficient number, since it is larger than the sum of its proper divisors (4404167).

22020805 is an equidigital number, since it uses as much as digits as its factorization.

22020805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4404166.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 22020805 is about 4692.6330561850. The cubic root of 22020805 is about 280.2922331584.

Adding to 22020805 its reverse (50802022), we get a palindrome (72822827).

It can be divided in two parts, 220 and 20805, that added together give a square (21025 = 145²).

The spelling of 22020805 in words is "twenty-two million, twenty thousand, eight hundred five".