20001013123 has 16 divisors (see below), whose sum is σ = 24622750656. Its totient is φ = 15821043840.

The previous prime is 20001013117. The next prime is 20001013183. The reversal of 20001013123 is 32131010002.

It is not a de Polignac number, because 20001013123 - 2⁵ = 20001013091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (20001013183) 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, 372813 + ... + 423073.

It is an arithmetic number, because the mean of its divisors is an integer number (1538921916).

Almost surely, 2^20001013123 is an apocalyptic number.

20001013123 is a deficient number, since it is larger than the sum of its proper divisors (4621737533).

20001013123 is a wasteful number, since it uses less digits than its factorization.

20001013123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54654.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 20001013123 its reverse (32131010002), we get a palindrome (52132023125).

The spelling of 20001013123 in words is "twenty billion, one million, thirteen thousand, one hundred twenty-three".