20120311123 has 24 divisors (see below), whose sum is σ = 22288676256. Its totient is φ = 18148690560.

The previous prime is 20120311111. The next prime is 20120311129. The reversal of 20120311123 is 32111302102.

It is not a de Polignac number, because 20120311123 - 2²¹ = 20118213971 is a prime.

It is a super-2 number, since 2×20120311123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20120311097 and 20120311106.

It is not an unprimeable number, because it can be changed into a prime (20120311129) 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, 10892586 + ... + 10894432.

It is an arithmetic number, because the mean of its divisors is an integer number (928694844).

Almost surely, 2^20120311123 is an apocalyptic number.

20120311123 is a deficient number, since it is larger than the sum of its proper divisors (2168365133).

20120311123 is a wasteful number, since it uses less digits than its factorization.

20120311123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523 (or 2512 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20120311123 its reverse (32111302102), we get a palindrome (52231613225).

The spelling of 20120311123 in words is "twenty billion, one hundred twenty million, three hundred eleven thousand, one hundred twenty-three".