22220657 has 4 divisors (see below), whose sum is σ = 22533696. Its totient is φ = 21907620.

The previous prime is 22220651. The next prime is 22220713. The reversal of 22220657 is 75602222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75602222 = 2 ⋅37801111.

It is a cyclic number.

It is not a de Polignac number, because 22220657 - 2¹² = 22216561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22220651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156413 + ... + 156554.

It is an arithmetic number, because the mean of its divisors is an integer number (5633424).

Almost surely, 2^22220657 is an apocalyptic number.

It is an amenable number.

22220657 is a deficient number, since it is larger than the sum of its proper divisors (313039).

22220657 is an equidigital number, since it uses as much as digits as its factorization.

22220657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313038.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 22220657 is about 4713.8791880998. The cubic root of 22220657 is about 281.1376208145.

Adding to 22220657 its reverse (75602222), we get a palindrome (97822879).

It can be divided in two parts, 222 and 20657, that multiplied together give a palindrome (4585854).

The spelling of 22220657 in words is "twenty-two million, two hundred twenty thousand, six hundred fifty-seven".