20123123512 has 8 divisors (see below), whose sum is σ = 37730856600. Its totient is φ = 10061561752.

The previous prime is 20123123483. The next prime is 20123123543. The reversal of 20123123512 is 21532132102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257695212 + ... + 1257695227.

It is an arithmetic number, because the mean of its divisors is an integer number (4716357075).

Almost surely, 2^20123123512 is an apocalyptic number.

It is an amenable number.

20123123512 is a deficient number, since it is larger than the sum of its proper divisors (17607733088).

20123123512 is a wasteful number, since it uses less digits than its factorization.

20123123512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515390445 (or 2515390441 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20123123512 its reverse (21532132102), we get a palindrome (41655255614).

The spelling of 20123123512 in words is "twenty billion, one hundred twenty-three million, one hundred twenty-three thousand, five hundred twelve".