20432424340 has 12 divisors (see below), whose sum is σ = 42908091156. Its totient is φ = 8172969728.

The previous prime is 20432424317. The next prime is 20432424347. The reversal of 20432424340 is 4342423402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8433850896 + 11998573444 = 91836^2 + 109538^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20432424299 and 20432424308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432424347) 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, 510810589 + ... + 510810628.

It is an arithmetic number, because the mean of its divisors is an integer number (3575674263).

Almost surely, 2^20432424340 is an apocalyptic number.

20432424340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20432424340 is an abundant number, since it is smaller than the sum of its proper divisors (22475666816).

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

20432424340 is a wasteful number, since it uses less digits than its factorization.

20432424340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021621226 (or 1021621224 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 20432424340 its reverse (4342423402), we get a palindrome (24774847742).

The spelling of 20432424340 in words is "twenty billion, four hundred thirty-two million, four hundred twenty-four thousand, three hundred forty".