20213420441 has 4 divisors (see below), whose sum is σ = 21092264832. Its totient is φ = 19334576052.

The previous prime is 20213420417. The next prime is 20213420453. The reversal of 20213420441 is 14402431202.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20213420441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 878844367 = 20213420441 / (2 + 0 + 2 + 1 + 3 + 4 + 2 + 0 + 4 + 4 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213423441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439422161 + ... + 439422206.

It is an arithmetic number, because the mean of its divisors is an integer number (5273066208).

Almost surely, 2^20213420441 is an apocalyptic number.

It is an amenable number.

20213420441 is a deficient number, since it is larger than the sum of its proper divisors (878844391).

20213420441 is an equidigital number, since it uses as much as digits as its factorization.

20213420441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878844390.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20213420441 its reverse (14402431202), we get a palindrome (34615851643).

The spelling of 20213420441 in words is "twenty billion, two hundred thirteen million, four hundred twenty thousand, four hundred forty-one".