20572424 has 8 divisors (see below), whose sum is σ = 38573310. Its totient is φ = 10286208.

The previous prime is 20572399. The next prime is 20572429. The reversal of 20572424 is 42427502.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 232324 = 4510^2 + 482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20572393 and 20572402.

It is not an unprimeable number, because it can be changed into a prime (20572429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1285769 + ... + 1285784.

Almost surely, 2^20572424 is an apocalyptic number.

It is an amenable number.

20572424 is a deficient number, since it is larger than the sum of its proper divisors (18000886).

20572424 is a wasteful number, since it uses less digits than its factorization.

20572424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571559 (or 2571555 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 20572424 is about 4535.6834104686. The cubic root of 20572424 is about 274.0071037283.

Adding to 20572424 its reverse (42427502), we get a palindrome (62999926).

The spelling of 20572424 in words is "twenty million, five hundred seventy-two thousand, four hundred twenty-four".