20522237 has 4 divisors (see below), whose sum is σ = 20540796. Its totient is φ = 20503680.

The previous prime is 20522219. The next prime is 20522239. The reversal of 20522237 is 73222502.

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 9803161 + 10719076 = 3131^2 + 3274^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522237 - 2⁸ = 20521981 is a prime.

It is a super-2 number, since 2×20522237² = 842324422968338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20522239) 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, 7508 + ... + 9869.

It is an arithmetic number, because the mean of its divisors is an integer number (5135199).

Almost surely, 2^20522237 is an apocalyptic number.

It is an amenable number.

20522237 is a deficient number, since it is larger than the sum of its proper divisors (18559).

20522237 is a wasteful number, since it uses less digits than its factorization.

20522237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18558.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20522237 is about 4530.1475693403. The cubic root of 20522237 is about 273.7841063126.

Adding to 20522237 its reverse (73222502), we get a palindrome (93744739).

The spelling of 20522237 in words is "twenty million, five hundred twenty-two thousand, two hundred thirty-seven".