20311444421 has 4 divisors (see below), whose sum is σ = 20317266144. Its totient is φ = 20305622700.

The previous prime is 20311444393. The next prime is 20311444457. The reversal of 20311444421 is 12444411302.

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 not a de Polignac number, because 20311444421 - 2¹⁴ = 20311428037 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 (20311444481) 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, 2905625 + ... + 2912606.

It is an arithmetic number, because the mean of its divisors is an integer number (5079316536).

Almost surely, 2^20311444421 is an apocalyptic number.

It is an amenable number.

20311444421 is a deficient number, since it is larger than the sum of its proper divisors (5821723).

20311444421 is an equidigital number, since it uses as much as digits as its factorization.

20311444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5821722.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 20311444421 its reverse (12444411302), we get a palindrome (32755855723).

The spelling of 20311444421 in words is "twenty billion, three hundred eleven million, four hundred forty-four thousand, four hundred twenty-one".