20019856 has 20 divisors (see below), whose sum is σ = 38997504. Its totient is φ = 9956000.

The previous prime is 20019851. The next prime is 20019869. The reversal of 20019856 is 65891002.

It is not an unprimeable number, because it can be changed into a prime (20019851) 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, 220 + ... + 6331.

Almost surely, 2^20019856 is an apocalyptic number.

It is an amenable number.

20019856 is a deficient number, since it is larger than the sum of its proper divisors (18977648).

20019856 is a wasteful number, since it uses less digits than its factorization.

20019856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6750 (or 6744 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 20019856 is about 4474.3553725649. The cubic root of 20019856 is about 271.5315610754.

The spelling of 20019856 in words is "twenty million, nineteen thousand, eight hundred fifty-six".