20414821 has 6 divisors (see below), whose sum is σ = 23747910. Its totient is φ = 17498376.

The previous prime is 20414819. The next prime is 20414857. The reversal of 20414821 is 12841402.

It can be written as a sum of positive squares in only one way, i.e., 12496225 + 7918596 = 3535^2 + 2814^2 .

It is not a de Polignac number, because 20414821 - 2¹ = 20414819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20414792 and 20414801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20414021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208266 + ... + 208363.

It is an arithmetic number, because the mean of its divisors is an integer number (3957985).

Almost surely, 2^20414821 is an apocalyptic number.

It is an amenable number.

20414821 is a deficient number, since it is larger than the sum of its proper divisors (3333089).

20414821 is an equidigital number, since it uses as much as digits as its factorization.

20414821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416643 (or 416636 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 20414821 is about 4518.2763306376. The cubic root of 20414821 is about 273.3055968617.

The spelling of 20414821 in words is "twenty million, four hundred fourteen thousand, eight hundred twenty-one".