20123230212 has 18 divisors (see below), whose sum is σ = 50867054238. Its totient is φ = 6707743392.

The previous prime is 20123230199. The next prime is 20123230247. The reversal of 20123230212 is 21203232102.

20123230212 is a `hidden beast` number, since 201 + 23 + 230 + 212 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19786360896 + 336869316 = 140664^2 + 18354^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279489273 + ... + 279489344.

Almost surely, 2^20123230212 is an apocalyptic number.

It is an amenable number.

20123230212 is an abundant number, since it is smaller than the sum of its proper divisors (30743824026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20123230212 is a wasteful number, since it uses less digits than its factorization.

20123230212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558978627 (or 558978622 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20123230212 its reverse (21203232102), we get a palindrome (41326462314).

The spelling of 20123230212 in words is "twenty billion, one hundred twenty-three million, two hundred thirty thousand, two hundred twelve".