20209424 has 20 divisors (see below), whose sum is σ = 39539136. Its totient is φ = 10005792.

The previous prime is 20209381. The next prime is 20209429. The reversal of 20209424 is 42490202.

It is a super-3 number, since 3×20209424³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20209424.

It is not an unprimeable number, because it can be changed into a prime (20209429) 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 in 3 ways as a sum of consecutive naturals, for example, 4484 + ... + 7779.

Almost surely, 2^20209424 is an apocalyptic number.

It is an amenable number.

20209424 is a deficient number, since it is larger than the sum of its proper divisors (19329712).

20209424 is a wasteful number, since it uses less digits than its factorization.

20209424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12374 (or 12368 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20209424 is about 4495.4892948377. The cubic root of 20209424 is about 272.3859141430.

Adding to 20209424 its reverse (42490202), we get a palindrome (62699626).

The spelling of 20209424 in words is "twenty million, two hundred nine thousand, four hundred twenty-four".