20187424 has 24 divisors (see below), whose sum is σ = 41837040. Its totient is φ = 9562176.

The previous prime is 20187421. The next prime is 20187467. The reversal of 20187424 is 42478102.

It is a junction number, because it is equal to n+sod(n) for n = 20187392 and 20187401.

It is not an unprimeable number, because it can be changed into a prime (20187421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15994 + ... + 17209.

It is an arithmetic number, because the mean of its divisors is an integer number (1743210).

Almost surely, 2^20187424 is an apocalyptic number.

It is an amenable number.

20187424 is an abundant number, since it is smaller than the sum of its proper divisors (21649616).

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

20187424 is a wasteful number, since it uses less digits than its factorization.

20187424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33232 (or 33224 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20187424 is about 4493.0417313887. The cubic root of 20187424 is about 272.2870383924.

The spelling of 20187424 in words is "twenty million, one hundred eighty-seven thousand, four hundred twenty-four".