20430372040 has 64 divisors (see below), whose sum is σ = 49610957760. Its totient is φ = 7527279360.

The previous prime is 20430372031. The next prime is 20430372073. The reversal of 20430372040 is 4027303402.

It is a junction number, because it is equal to n+sod(n) for n = 20430371996 and 20430372014.

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, 200775 + ... + 284905.

It is an arithmetic number, because the mean of its divisors is an integer number (775171215).

Almost surely, 2^20430372040 is an apocalyptic number.

20430372040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20430372040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24805478880).

20430372040 is an abundant number, since it is smaller than the sum of its proper divisors (29180585720).

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

20430372040 is a wasteful number, since it uses less digits than its factorization.

20430372040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84622 (or 84618 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 25.

Adding to 20430372040 its reverse (4027303402), we get a palindrome (24457675442).

The spelling of 20430372040 in words is "twenty billion, four hundred thirty million, three hundred seventy-two thousand, forty".