20430572 has 6 divisors (see below), whose sum is σ = 35753508. Its totient is φ = 10215284.

The previous prime is 20430563. The next prime is 20430577. The reversal of 20430572 is 27503402.

It is not an unprimeable number, because it can be changed into a prime (20430577) 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 as a sum of consecutive naturals, namely, 2553818 + ... + 2553825.

It is an arithmetic number, because the mean of its divisors is an integer number (5958918).

Almost surely, 2^20430572 is an apocalyptic number.

It is an amenable number.

20430572 is a deficient number, since it is larger than the sum of its proper divisors (15322936).

20430572 is a wasteful number, since it uses less digits than its factorization.

20430572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5107647 (or 5107645 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20430572 is about 4520.0190265086. The cubic root of 20430572 is about 273.3758681905.

Adding to 20430572 its reverse (27503402), we get a palindrome (47933974).

The spelling of 20430572 in words is "twenty million, four hundred thirty thousand, five hundred seventy-two".