20440142324440 has 32 divisors (see below), whose sum is σ = 47059862564880. Its totient is φ = 7985916070272.

The previous prime is 20440142324401. The next prime is 20440142324473. The reversal of 20440142324440 is 4442324104402.

It is a junction number, because it is equal to n+sod(n) for n = 20440142324396 and 20440142324405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5941900119 + ... + 5941903558.

Almost surely, 2^{20440142324440} is an apocalyptic number.

20440142324440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440142324440 is an abundant number, since it is smaller than the sum of its proper divisors (26619720240440).

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

20440142324440 is a wasteful number, since it uses less digits than its factorization.

20440142324440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11883803731 (or 11883803727 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 34.

Adding to 20440142324440 its reverse (4442324104402), we get a palindrome (24882466428842).

The spelling of 20440142324440 in words is "twenty trillion, four hundred forty billion, one hundred forty-two million, three hundred twenty-four thousand, four hundred forty".