20225521 has 2 divisors, whose sum is σ = 20225522. Its totient is φ = 20225520.

The previous prime is 20225507. The next prime is 20225539. The reversal of 20225521 is 12552202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10491121 + 9734400 = 3239^2 + 3120^2 .

It is a cyclic number.

It is not a de Polignac number, because 20225521 - 2¹¹ = 20223473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20225561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10112760 + 10112761.

It is an arithmetic number, because the mean of its divisors is an integer number (10112761).

Almost surely, 2^20225521 is an apocalyptic number.

It is an amenable number.

20225521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20225521 is an equidigital number, since it uses as much as digits as its factorization.

20225521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20225521 is about 4497.2792886366. The cubic root of 20225521 is about 272.4582142813.

Adding to 20225521 its reverse (12552202), we get a palindrome (32777723).

The spelling of 20225521 in words is "twenty million, two hundred twenty-five thousand, five hundred twenty-one".