20609924 has 6 divisors (see below), whose sum is σ = 36067374. Its totient is φ = 10304960.

The previous prime is 20609917. The next prime is 20609929. The reversal of 20609924 is 42990602.

It can be written as a sum of positive squares in only one way, i.e., 19360000 + 1249924 = 4400^2 + 1118^2 .

It is not an unprimeable number, because it can be changed into a prime (20609929) 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 as a sum of consecutive naturals, namely, 2576237 + ... + 2576244.

It is an arithmetic number, because the mean of its divisors is an integer number (6011229).

Almost surely, 2^20609924 is an apocalyptic number.

It is an amenable number.

20609924 is a deficient number, since it is larger than the sum of its proper divisors (15457450).

20609924 is a wasteful number, since it uses less digits than its factorization.

20609924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5152485 (or 5152483 counting only the distinct ones).

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

The square root of 20609924 is about 4539.8154147498. The cubic root of 20609924 is about 274.1734919860.

The spelling of 20609924 in words is "twenty million, six hundred nine thousand, nine hundred twenty-four".