19797700 has 72 divisors (see below), whose sum is σ = 47040392. Its totient is φ = 7188480.

The previous prime is 19797689. The next prime is 19797727. The reversal of 19797700 is 779791.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 11410884 + 8386816 = 3378^2 + 2896^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126022 + ... + 126178.

Almost surely, 2^19797700 is an apocalyptic number.

19797700 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 19797700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23520196).

19797700 is an abundant number, since it is smaller than the sum of its proper divisors (27242692).

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

19797700 is a wasteful number, since it uses less digits than its factorization.

19797700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 27783, while the sum is 40.

The square root of 19797700 is about 4449.4606414711. The cubic root of 19797700 is about 270.5234472747.

The spelling of 19797700 in words is "nineteen million, seven hundred ninety-seven thousand, seven hundred".