20506423703844 has 192 divisors, whose sum is σ = 52934658416640. Its totient is φ = 6138746127360.

The previous prime is 20506423703833. The next prime is 20506423703903. The reversal of 20506423703844 is 44830732460502.

It is a junction number, because it is equal to n+sod(n) for n = 20506423703793 and 20506423703802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1834692784 + ... + 1834703960.

It is an arithmetic number, because the mean of its divisors is an integer number (275701345920).

Almost surely, 2^{20506423703844} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20506423703844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26467329208320).

20506423703844 is an abundant number, since it is smaller than the sum of its proper divisors (32428234712796).

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

20506423703844 is a wasteful number, since it uses less digits than its factorization.

20506423703844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12290 (or 12288 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 48.

The spelling of 20506423703844 in words is "twenty trillion, five hundred six billion, four hundred twenty-three million, seven hundred three thousand, eight hundred forty-four".