20420130432 has 128 divisors (see below), whose sum is σ = 58519440000. Its totient is φ = 6271709184.

The previous prime is 20420130421. The next prime is 20420130461. The reversal of 20420130432 is 23403102402.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 20420130399 and 20420130408.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2986794 + ... + 2993622.

It is an arithmetic number, because the mean of its divisors is an integer number (457183125).

Almost surely, 2^20420130432 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 20420130432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29259720000).

20420130432 is an abundant number, since it is smaller than the sum of its proper divisors (38099309568).

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

20420130432 is a wasteful number, since it uses less digits than its factorization.

20420130432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7458 (or 7446 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20420130432 its reverse (23403102402), we get a palindrome (43823232834).

The spelling of 20420130432 in words is "twenty billion, four hundred twenty million, one hundred thirty thousand, four hundred thirty-two".