19986828 has 12 divisors (see below), whose sum is σ = 46635960. Its totient is φ = 6662272.

The previous prime is 19986817. The next prime is 19986871. The reversal of 19986828 is 82868991.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832773 + ... + 832796.

It is an arithmetic number, because the mean of its divisors is an integer number (3886330).

Almost surely, 2^19986828 is an apocalyptic number.

It is an amenable number.

19986828 is an abundant number, since it is smaller than the sum of its proper divisors (26649132).

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

19986828 is a wasteful number, since it uses less digits than its factorization.

19986828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665576 (or 1665574 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 19986828 is about 4470.6630380739. The cubic root of 19986828 is about 271.3821580579.

The spelling of 19986828 in words is "nineteen million, nine hundred eighty-six thousand, eight hundred twenty-eight".