20431221230 has 64 divisors (see below), whose sum is σ = 43513251840. Its totient is φ = 6758150784.

The previous prime is 20431221221. The next prime is 20431221247. The reversal of 20431221230 is 3212213402.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3259079 + ... + 3265341.

It is an arithmetic number, because the mean of its divisors is an integer number (679894560).

Almost surely, 2^20431221230 is an apocalyptic number.

20431221230 is an abundant number, since it is smaller than the sum of its proper divisors (23082030610).

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

20431221230 is a wasteful number, since it uses less digits than its factorization.

20431221230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7913.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20431221230 its reverse (3212213402), we get a palindrome (23643434632).

The spelling of 20431221230 in words is "twenty billion, four hundred thirty-one million, two hundred twenty-one thousand, two hundred thirty".