20012011123 has 24 divisors (see below), whose sum is σ = 21858984000. Its totient is φ = 18311963904.

The previous prime is 20012011109. The next prime is 20012011127. The reversal of 20012011123 is 32111021002.

It is a de Polignac number, because none of the positive numbers 2^k-20012011123 is a prime.

It is a super-2 number, since 2×20012011123² (a number of 21 digits) contains 22 as substring.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012011127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19076703 + ... + 19077751.

It is an arithmetic number, because the mean of its divisors is an integer number (910791000).

Almost surely, 2^20012011123 is an apocalyptic number.

20012011123 is a deficient number, since it is larger than the sum of its proper divisors (1846972877).

20012011123 is a wasteful number, since it uses less digits than its factorization.

20012011123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951 (or 1938 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20012011123 its reverse (32111021002), we get a palindrome (52123032125).

The spelling of 20012011123 in words is "twenty billion, twelve million, eleven thousand, one hundred twenty-three".