19897660 has 48 divisors (see below), whose sum is σ = 43868160. Its totient is φ = 7571520.

The previous prime is 19897627. The next prime is 19897663. The reversal of 19897660 is 6679891.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19897660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19897663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41301 + ... + 41779.

It is an arithmetic number, because the mean of its divisors is an integer number (913920).

Almost surely, 2^19897660 is an apocalyptic number.

19897660 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 19897660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21934080).

19897660 is an abundant number, since it is smaller than the sum of its proper divisors (23970500).

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

19897660 is a wasteful number, since it uses less digits than its factorization.

19897660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 19897660 is about 4460.6793204623. The cubic root of 19897660 is about 270.9779805369.

The spelling of 19897660 in words is "nineteen million, eight hundred ninety-seven thousand, six hundred sixty".