20522401 has 4 divisors (see below), whose sum is σ = 21230100. Its totient is φ = 19814704.

The previous prime is 20522363. The next prime is 20522419. The reversal of 20522401 is 10422502.

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 15023376 + 5499025 = 3876^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522401 - 2⁹ = 20521889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20529401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353806 + ... + 353863.

It is an arithmetic number, because the mean of its divisors is an integer number (5307525).

Almost surely, 2^20522401 is an apocalyptic number.

It is an amenable number.

20522401 is a deficient number, since it is larger than the sum of its proper divisors (707699).

20522401 is an equidigital number, since it uses as much as digits as its factorization.

20522401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707698.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20522401 is about 4530.1656702598. The cubic root of 20522401 is about 273.7848356105.

Adding to 20522401 its reverse (10422502), we get a palindrome (30944903).

The spelling of 20522401 in words is "twenty million, five hundred twenty-two thousand, four hundred one".