20321443230 has 128 divisors (see below), whose sum is σ = 55608975360. Its totient is φ = 4704543360.

The previous prime is 20321443223. The next prime is 20321443271. The reversal of 20321443230 is 3234412302.

It is a super-2 number, since 2×20321443230² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20321443230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5607199 + ... + 5610821.

It is an arithmetic number, because the mean of its divisors is an integer number (434445120).

Almost surely, 2^20321443230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20321443230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27804487680).

20321443230 is an abundant number, since it is smaller than the sum of its proper divisors (35287532130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20321443230 is a wasteful number, since it uses less digits than its factorization.

20321443230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4406.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 20321443230 its reverse (3234412302), we get a palindrome (23555855532).

The spelling of 20321443230 in words is "twenty billion, three hundred twenty-one million, four hundred forty-three thousand, two hundred thirty".