19806836 has 24 divisors (see below), whose sum is σ = 41944896. Its totient is φ = 7989120.

The previous prime is 19806833. The next prime is 19806851. The reversal of 19806836 is 63860891.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19806793 and 19806802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19806833) 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 in 7 ways as a sum of consecutive naturals, for example, 20330 + ... + 21281.

It is an arithmetic number, because the mean of its divisors is an integer number (1747704).

Almost surely, 2^19806836 is an apocalyptic number.

It is an amenable number.

19806836 is an abundant number, since it is smaller than the sum of its proper divisors (22138060).

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

19806836 is a wasteful number, since it uses less digits than its factorization.

19806836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41639 (or 41637 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 19806836 is about 4450.4871643450. The cubic root of 19806836 is about 270.5650534905.

The spelling of 19806836 in words is "nineteen million, eight hundred six thousand, eight hundred thirty-six".