22220641 has 4 divisors (see below), whose sum is σ = 22986900. Its totient is φ = 21454384.

The previous prime is 22220629. The next prime is 22220651. The reversal of 22220641 is 14602222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10214416 + 12006225 = 3196^2 + 3465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22220641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22220651) 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, 383086 + ... + 383143.

It is an arithmetic number, because the mean of its divisors is an integer number (5746725).

Almost surely, 2^22220641 is an apocalyptic number.

It is an amenable number.

22220641 is a deficient number, since it is larger than the sum of its proper divisors (766259).

22220641 is an equidigital number, since it uses as much as digits as its factorization.

22220641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766258.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 22220641 is about 4713.8774909834. The cubic root of 22220641 is about 281.1375533367.

Adding to 22220641 its reverse (14602222), we get a palindrome (36822863).

The spelling of 22220641 in words is "twenty-two million, two hundred twenty thousand, six hundred forty-one".