19897700 has 18 divisors (see below), whose sum is σ = 43178226. Its totient is φ = 7959040.

The previous prime is 19897699. The next prime is 19897729. The reversal of 19897700 is 779891.

It can be written as a sum of positive squares in 3 ways, for example, as 1459264 + 18438436 = 1208^2 + 4294^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99389 + ... + 99588.

Almost surely, 2^19897700 is an apocalyptic number.

19897700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19897700 is an abundant number, since it is smaller than the sum of its proper divisors (23280526).

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

19897700 is a wasteful number, since it uses less digits than its factorization.

19897700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198991 (or 198984 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 19897700 is about 4460.6838040821. The cubic root of 19897700 is about 270.9781621179.

The spelling of 19897700 in words is "nineteen million, eight hundred ninety-seven thousand, seven hundred".