20019884 has 6 divisors (see below), whose sum is σ = 35034804. Its totient is φ = 10009940.

The previous prime is 20019869. The next prime is 20019887. The reversal of 20019884 is 48891002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20019884.

It is not an unprimeable number, because it can be changed into a prime (20019887) 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, 2502482 + ... + 2502489.

It is an arithmetic number, because the mean of its divisors is an integer number (5839134).

Almost surely, 2^20019884 is an apocalyptic number.

It is an amenable number.

20019884 is a deficient number, since it is larger than the sum of its proper divisors (15014920).

20019884 is a wasteful number, since it uses less digits than its factorization.

20019884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004975 (or 5004973 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20019884 is about 4474.3585015061. The cubic root of 20019884 is about 271.5316876644.

The spelling of 20019884 in words is "twenty million, nineteen thousand, eight hundred eighty-four".