20145434472 has 24 divisors (see below), whose sum is σ = 54560551890. Its totient is φ = 6715144800.

The previous prime is 20145434471. The next prime is 20145434521. The reversal of 20145434472 is 27443454102.

20145434472 is a `hidden beast` number, since 2 + 0 + 1 + 4 + 543 + 44 + 72 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18110161476 + 2035272996 = 134574^2 + 45114^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20145434471) 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 5 ways as a sum of consecutive naturals, for example, 139898779 + ... + 139898922.

Almost surely, 2^20145434472 is an apocalyptic number.

It is an amenable number.

20145434472 is an abundant number, since it is smaller than the sum of its proper divisors (34415117418).

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

20145434472 is a wasteful number, since it uses less digits than its factorization.

20145434472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279797713 (or 279797706 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 36.

Adding to 20145434472 its reverse (27443454102), we get a palindrome (47588888574).

The spelling of 20145434472 in words is "twenty billion, one hundred forty-five million, four hundred thirty-four thousand, four hundred seventy-two".