20123001234 has 160 divisors (see below), whose sum is σ = 52947772416. Its totient is φ = 5593626720.

The previous prime is 20123001233. The next prime is 20123001247. The reversal of 20123001234 is 43210032102.

20123001234 is a `hidden beast` number, since 201 + 230 + 0 + 1 + 234 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (20123001233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6304579 + ... + 6307769.

Almost surely, 2^20123001234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20123001234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26473886208).

20123001234 is an abundant number, since it is smaller than the sum of its proper divisors (32824771182).

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

20123001234 is a wasteful number, since it uses less digits than its factorization.

20123001234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3362 (or 3353 counting only the distinct ones).

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

Adding to 20123001234 its reverse (43210032102), we get a palindrome (63333033336).

The spelling of 20123001234 in words is "twenty billion, one hundred twenty-three million, one thousand, two hundred thirty-four".