20001332123129 has 16 divisors (see below), whose sum is σ = 24061919354880. Its totient is φ = 16241570891280.

The previous prime is 20001332123077. The next prime is 20001332123131. The reversal of 20001332123129 is 92132123310002.

It is not a de Polignac number, because 20001332123129 - 2⁴⁰ = 18901820495353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001332123189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22646312 + ... + 23512934.

It is an arithmetic number, because the mean of its divisors is an integer number (1503869959680).

Almost surely, 2^{20001332123129} is an apocalyptic number.

It is an amenable number.

20001332123129 is a deficient number, since it is larger than the sum of its proper divisors (4060587231751).

20001332123129 is a wasteful number, since it uses less digits than its factorization.

20001332123129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040180.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 20001332123129 in words is "twenty trillion, one billion, three hundred thirty-two million, one hundred twenty-three thousand, one hundred twenty-nine".