19797536 has 36 divisors (see below), whose sum is σ = 42850206. Its totient is φ = 8997120.

The previous prime is 19797529. The next prime is 19797539. The reversal of 19797536 is 63579791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 48400 = 4444^2 + 220^2 .

It is not an unprimeable number, because it can be changed into a prime (19797539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1316 + ... + 6428.

Almost surely, 2^19797536 is an apocalyptic number.

19797536 is a gapful number since it is divisible by the number (16) 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 19797536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21425103).

19797536 is an abundant number, since it is smaller than the sum of its proper divisors (23052670).

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

19797536 is a wasteful number, since it uses less digits than its factorization.

19797536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5145 (or 5126 counting only the distinct ones).

The product of its digits is 357210, while the sum is 47.

The square root of 19797536 is about 4449.4422122329. The cubic root of 19797536 is about 270.5227002861.

The spelling of 19797536 in words is "nineteen million, seven hundred ninety-seven thousand, five hundred thirty-six".