20434431232 has 36 divisors (see below), whose sum is σ = 40874440320. Its totient is φ = 10195824128.

The previous prime is 20434431223. The next prime is 20434431247. The reversal of 20434431232 is 23213443402.

It is a self number, because there is not a number n which added to its sum of digits gives 20434431232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39303 + ... + 205945.

It is an arithmetic number, because the mean of its divisors is an integer number (1135401120).

Almost surely, 2^20434431232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20434431232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20437220160).

20434431232 is an abundant number, since it is smaller than the sum of its proper divisors (20440009088).

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

20434431232 is an equidigital number, since it uses as much as digits as its factorization.

20434431232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167138 (or 167124 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 20434431232 its reverse (23213443402), we get a palindrome (43647874634).

The spelling of 20434431232 in words is "twenty billion, four hundred thirty-four million, four hundred thirty-one thousand, two hundred thirty-two".