20423434122 has 288 divisors, whose sum is σ = 59075033472. Its totient is φ = 5237882496.

The previous prime is 20423434079. The next prime is 20423434123. The reversal of 20423434122 is 22143432402.

20423434122 is a `hidden beast` number, since 204 + 2 + 3 + 43 + 412 + 2 = 666.

It is a super-2 number, since 2×20423434122² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20423434123) 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 143 ways as a sum of consecutive naturals, for example, 11453643 + ... + 11455425.

It is an arithmetic number, because the mean of its divisors is an integer number (205121644).

Almost surely, 2^20423434122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20423434122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29537516736).

20423434122 is an abundant number, since it is smaller than the sum of its proper divisors (38651599350).

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

20423434122 is a wasteful number, since it uses less digits than its factorization.

20423434122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864 (or 1845 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20423434122 its reverse (22143432402), we get a palindrome (42566866524).

The spelling of 20423434122 in words is "twenty billion, four hundred twenty-three million, four hundred thirty-four thousand, one hundred twenty-two".