22006157 has 8 divisors (see below), whose sum is σ = 23381400. Its totient is φ = 20672064.

The previous prime is 22006133. The next prime is 22006163. The reversal of 22006157 is 75160022.

It can be written as a sum of positive squares in 4 ways, for example, as 4583881 + 17422276 = 2141^2 + 4174^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22006157 - 2⁶ = 22006093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22006057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9182 + ... + 11327.

It is an arithmetic number, because the mean of its divisors is an integer number (2922675).

Almost surely, 2^22006157 is an apocalyptic number.

It is an amenable number.

22006157 is a deficient number, since it is larger than the sum of its proper divisors (1375243).

22006157 is a wasteful number, since it uses less digits than its factorization.

22006157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20575.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 22006157 is about 4691.0720523138. The cubic root of 22006157 is about 280.2300702580.

Adding to 22006157 its reverse (75160022), we get a palindrome (97166179).

The spelling of 22006157 in words is "twenty-two million, six thousand, one hundred fifty-seven".