20019916 has 24 divisors (see below), whose sum is σ = 40162976. Its totient is φ = 8553600.

The previous prime is 20019907. The next prime is 20019929. The reversal of 20019916 is 61991002.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 10216 + ... + 12016.

Almost surely, 2^20019916 is an apocalyptic number.

It is an amenable number.

20019916 is an abundant number, since it is smaller than the sum of its proper divisors (20143060).

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

20019916 is a wasteful number, since it uses less digits than its factorization.

20019916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209 (or 2207 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 20019916 is about 4474.3620774363. The cubic root of 20019916 is about 271.5318323374.

The spelling of 20019916 in words is "twenty million, nineteen thousand, nine hundred sixteen".