20430124440 has 256 divisors, whose sum is σ = 70562534400. Its totient is φ = 4683571200.

The previous prime is 20430124409. The next prime is 20430124441. The reversal of 20430124440 is 4442103402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20430124440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430124441) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2698260 + ... + 2705820.

It is an arithmetic number, because the mean of its divisors is an integer number (275634900).

Almost surely, 2^20430124440 is an apocalyptic number.

20430124440 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 20430124440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35281267200).

20430124440 is an abundant number, since it is smaller than the sum of its proper divisors (50132409960).

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

20430124440 is a wasteful number, since it uses less digits than its factorization.

20430124440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7698 (or 7694 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20430124440 its reverse (4442103402), we get a palindrome (24872227842).

The spelling of 20430124440 in words is "twenty billion, four hundred thirty million, one hundred twenty-four thousand, four hundred forty".