20530444 has 24 divisors (see below), whose sum is σ = 40900608. Its totient is φ = 8925840.

The previous prime is 20530427. The next prime is 20530453. The reversal of 20530444 is 44403502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9132 + ... + 11155.

It is an arithmetic number, because the mean of its divisors is an integer number (1704192).

Almost surely, 2^20530444 is an apocalyptic number.

It is an amenable number.

20530444 is a deficient number, since it is larger than the sum of its proper divisors (20370164).

20530444 is a wasteful number, since it uses less digits than its factorization.

20530444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20325 (or 20323 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20530444 is about 4531.0532991789. The cubic root of 20530444 is about 273.8205975701.

Adding to 20530444 its reverse (44403502), we get a palindrome (64933946).

The spelling of 20530444 in words is "twenty million, five hundred thirty thousand, four hundred forty-four".