20053821 has 4 divisors (see below), whose sum is σ = 26738432. Its totient is φ = 13369212.

The previous prime is 20053801. The next prime is 20053841. The reversal of 20053821 is 12835002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20053801) and next prime (20053841).

It is not a de Polignac number, because 20053821 - 2¹³ = 20045629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20053801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3342301 + ... + 3342306.

It is an arithmetic number, because the mean of its divisors is an integer number (6684608).

Almost surely, 2^20053821 is an apocalyptic number.

It is an amenable number.

20053821 is a deficient number, since it is larger than the sum of its proper divisors (6684611).

20053821 is an equidigital number, since it uses as much as digits as its factorization.

20053821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684610.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20053821 is about 4478.1492829069. The cubic root of 20053821 is about 271.6850313571.

Adding to 20053821 its reverse (12835002), we get a palindrome (32888823).

The spelling of 20053821 in words is "twenty million, fifty-three thousand, eight hundred twenty-one".