19686920 has 64 divisors (see below), whose sum is σ = 48911040. Its totient is φ = 7072000.

The previous prime is 19686913. The next prime is 19686949. The reversal of 19686920 is 2968691.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44219 + ... + 44661.

It is an arithmetic number, because the mean of its divisors is an integer number (764235).

Almost surely, 2^19686920 is an apocalyptic number.

19686920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19686920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24455520).

19686920 is an abundant number, since it is smaller than the sum of its proper divisors (29224120).

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

19686920 is a wasteful number, since it uses less digits than its factorization.

19686920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 19686920 is about 4436.9944782476. The cubic root of 19686920 is about 270.0179229072.

It can be divided in two parts, 1968 and 6920, that added together give a palindrome (8888).

The spelling of 19686920 in words is "nineteen million, six hundred eighty-six thousand, nine hundred twenty".