20330444421 has 60 divisors (see below), whose sum is σ = 35379816780. Its totient is φ = 11600547840.

The previous prime is 20330444417. The next prime is 20330444437. The reversal of 20330444421 is 12444403302.

It is a happy number.

20330444421 is a `hidden beast` number, since 203 + 30 + 4 + 4 + 4 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14403600225 + 5926844196 = 120015^2 + 76986^2 .

It is not a de Polignac number, because 20330444421 - 2² = 20330444417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20330444401) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3048831 + ... + 3055491.

It is an arithmetic number, because the mean of its divisors is an integer number (589663613).

Almost surely, 2^20330444421 is an apocalyptic number.

20330444421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20330444421 is a deficient number, since it is larger than the sum of its proper divisors (15049372359).

20330444421 is an equidigital number, since it uses as much as digits as its factorization.

20330444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7456 (or 7440 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20330444421 its reverse (12444403302), we get a palindrome (32774847723).

The spelling of 20330444421 in words is "twenty billion, three hundred thirty million, four hundred forty-four thousand, four hundred twenty-one".