22120657 has 4 divisors (see below), whose sum is σ = 23822260. Its totient is φ = 20419056.

The previous prime is 22120643. The next prime is 22120661. The reversal of 22120657 is 75602122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75602122 = 2 ⋅37801061.

It can be written as a sum of positive squares in 2 ways, for example, as 9511056 + 12609601 = 3084^2 + 3551^2 .

It is a cyclic number.

It is not a de Polignac number, because 22120657 - 2¹¹ = 22118609 is a prime.

It is a super-2 number, since 2×22120657² = 978646932223298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22120697) 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, 850782 + ... + 850807.

It is an arithmetic number, because the mean of its divisors is an integer number (5955565).

Almost surely, 2^22120657 is an apocalyptic number.

It is an amenable number.

22120657 is a deficient number, since it is larger than the sum of its proper divisors (1701603).

22120657 is a wasteful number, since it uses less digits than its factorization.

22120657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701602.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 22120657 is about 4703.2602522080. The cubic root of 22120657 is about 280.7152504430.

Adding to 22120657 its reverse (75602122), we get a palindrome (97722779).

The spelling of 22120657 in words is "twenty-two million, one hundred twenty thousand, six hundred fifty-seven".