20001332123123 has 32 divisors (see below), whose sum is σ = 23284786678272. Its totient is φ = 17015210956800.

The previous prime is 20001332123077. The next prime is 20001332123131. The reversal of 20001332123123 is 32132123310002.

It is a cyclic number.

It is not a de Polignac number, because 20001332123123 - 2¹⁶ = 20001332057587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20001332123923) 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, 320348 + ... + 6332873.

It is an arithmetic number, because the mean of its divisors is an integer number (727649583696).

Almost surely, 2^{20001332123123} is an apocalyptic number.

20001332123123 is a deficient number, since it is larger than the sum of its proper divisors (3283454555149).

20001332123123 is a wasteful number, since it uses less digits than its factorization.

20001332123123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6653535.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 20001332123123 its reverse (32132123310002), we get a palindrome (52133455433125).

The spelling of 20001332123123 in words is "twenty trillion, one billion, three hundred thirty-two million, one hundred twenty-three thousand, one hundred twenty-three".