20440352424 has 64 divisors (see below), whose sum is σ = 54177647040. Its totient is φ = 6404264960.

The previous prime is 20440352411. The next prime is 20440352453. The reversal of 20440352424 is 42425304402.

It is a junction number, because it is equal to n+sod(n) for n = 20440352391 and 20440352400.

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, 282979 + ... + 347789.

It is an arithmetic number, because the mean of its divisors is an integer number (846525735).

Almost surely, 2^20440352424 is an apocalyptic number.

20440352424 is a gapful number since it is divisible by the number (24) 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 20440352424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27088823520).

20440352424 is an abundant number, since it is smaller than the sum of its proper divisors (33737294616).

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

20440352424 is a wasteful number, since it uses less digits than its factorization.

20440352424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65610 (or 65606 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 30.

Adding to 20440352424 its reverse (42425304402), we get a palindrome (62865656826).

The spelling of 20440352424 in words is "twenty billion, four hundred forty million, three hundred fifty-two thousand, four hundred twenty-four".