20412223440 has 160 divisors (see below), whose sum is σ = 72423816960. Its totient is φ = 4658798592.

The previous prime is 20412223411. The next prime is 20412223441. The reversal of 20412223440 is 4432221402.

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 20412223440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20412223441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1182552 + ... + 1199688.

It is an arithmetic number, because the mean of its divisors is an integer number (452648856).

Almost surely, 2^20412223440 is an apocalyptic number.

20412223440 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 20412223440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36211908480).

20412223440 is an abundant number, since it is smaller than the sum of its proper divisors (52011593520).

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

20412223440 is a wasteful number, since it uses less digits than its factorization.

20412223440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17869 (or 17863 counting only the distinct ones).

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

Adding to 20412223440 its reverse (4432221402), we get a palindrome (24844444842).

The spelling of 20412223440 in words is "twenty billion, four hundred twelve million, two hundred twenty-three thousand, four hundred forty".