20909624 has 16 divisors (see below), whose sum is σ = 40470720. Its totient is φ = 10117440.

The previous prime is 20909621. The next prime is 20909657. The reversal of 20909624 is 42690902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20909621) 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, 41909 + ... + 42404.

It is an arithmetic number, because the mean of its divisors is an integer number (2529420).

Almost surely, 2^20909624 is an apocalyptic number.

It is an amenable number.

20909624 is a deficient number, since it is larger than the sum of its proper divisors (19561096).

20909624 is a wasteful number, since it uses less digits than its factorization.

20909624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84350 (or 84346 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20909624 is about 4572.7042327271. The cubic root of 20909624 is about 275.4960698954.

The spelling of 20909624 in words is "twenty million, nine hundred nine thousand, six hundred twenty-four".