20123111002 has 12 divisors (see below), whose sum is σ = 30704952906. Its totient is φ = 9891017240.

The previous prime is 20123110979. The next prime is 20123111009. The reversal of 20123111002 is 20011132102.

It can be written as a sum of positive squares in only one way, i.e., 19568932321 + 554178681 = 139889^2 + 23541^2 .

It is a super-3 number, since 3×20123111002³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20123111009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1438249 + ... + 1452172.

Almost surely, 2^20123111002 is an apocalyptic number.

20123111002 is a deficient number, since it is larger than the sum of its proper divisors (10581841904).

20123111002 is an equidigital number, since it uses as much as digits as its factorization.

20123111002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890541 (or 2890482 counting only the distinct ones).

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

Adding to 20123111002 its reverse (20011132102), we get a palindrome (40134243104).

The spelling of 20123111002 in words is "twenty billion, one hundred twenty-three million, one hundred eleven thousand, two".