20909024 has 24 divisors (see below), whose sum is σ = 42955920. Its totient is φ = 9999616.

The previous prime is 20909023. The next prime is 20909027. The reversal of 20909024 is 42090902.

It is a junction number, because it is equal to n+sod(n) for n = 20908984 and 20909002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20909023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13469 + ... + 14940.

It is an arithmetic number, because the mean of its divisors is an integer number (1789830).

Almost surely, 2^20909024 is an apocalyptic number.

It is an amenable number.

20909024 is an abundant number, since it is smaller than the sum of its proper divisors (22046896).

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

20909024 is a wasteful number, since it uses less digits than its factorization.

20909024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28442 (or 28434 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20909024 is about 4572.6386255640. The cubic root of 20909024 is about 275.4934347576.

Adding to 20909024 its reverse (42090902), we get a palindrome (62999926).

The spelling of 20909024 in words is "twenty million, nine hundred nine thousand, twenty-four".