20001332123124 has 144 divisors (see below), whose sum is σ = 53628612516864. Its totient is φ = 5753229310400.

The previous prime is 20001332123077. The next prime is 20001332123131. The reversal of 20001332123124 is 42132123310002.

It is a junction number, because it is equal to n+sod(n) for n = 20001332123094 and 20001332123103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8054197 + ... + 10240739.

It is an arithmetic number, because the mean of its divisors is an integer number (372420920256).

Almost surely, 2^{20001332123124} 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 20001332123124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26814306258432).

20001332123124 is an abundant number, since it is smaller than the sum of its proper divisors (33627280393740).

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

20001332123124 is a wasteful number, since it uses less digits than its factorization.

20001332123124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186738 (or 2186713 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 20001332123124 its reverse (42132123310002), we get a palindrome (62133455433126).

The spelling of 20001332123124 in words is "twenty trillion, one billion, three hundred thirty-two million, one hundred twenty-three thousand, one hundred twenty-four".