20414521 has 4 divisors (see below), whose sum is σ = 21118500. Its totient is φ = 19710544.

The previous prime is 20414503. The next prime is 20414533. The reversal of 20414521 is 12541402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12541402 = 2 ⋅6270701.

It can be written as a sum of positive squares in 2 ways, for example, as 16088121 + 4326400 = 4011^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 20414521 - 2⁷ = 20414393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20414561) 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, 351946 + ... + 352003.

It is an arithmetic number, because the mean of its divisors is an integer number (5279625).

Almost surely, 2^20414521 is an apocalyptic number.

It is an amenable number.

20414521 is a deficient number, since it is larger than the sum of its proper divisors (703979).

20414521 is an equidigital number, since it uses as much as digits as its factorization.

20414521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703978.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20414521 is about 4518.2431320149. The cubic root of 20414521 is about 273.3042580944.

Adding to 20414521 its reverse (12541402), we get a palindrome (32955923).

The spelling of 20414521 in words is "twenty million, four hundred fourteen thousand, five hundred twenty-one".