20412443440 has 80 divisors (see below), whose sum is σ = 49717353600. Its totient is φ = 7783566336.

The previous prime is 20412443423. The next prime is 20412443461. The reversal of 20412443440 is 4434421402.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 20412443399 and 20412443408.

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, 127594 + ... + 238966.

It is an arithmetic number, because the mean of its divisors is an integer number (621466920).

Almost surely, 2^20412443440 is an apocalyptic number.

20412443440 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 20412443440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24858676800).

20412443440 is an abundant number, since it is smaller than the sum of its proper divisors (29304910160).

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

20412443440 is a wasteful number, since it uses less digits than its factorization.

20412443440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111494 (or 111488 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 20412443440 its reverse (4434421402), we get a palindrome (24846864842).

The spelling of 20412443440 in words is "twenty billion, four hundred twelve million, four hundred forty-three thousand, four hundred forty".