19797240 has 96 divisors (see below), whose sum is σ = 62819280. Its totient is φ = 4990464.

The previous prime is 19797223. The next prime is 19797241. The reversal of 19797240 is 4279791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19797241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43092 + ... + 43548.

Almost surely, 2^19797240 is an apocalyptic number.

19797240 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 19797240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31409640).

19797240 is an abundant number, since it is smaller than the sum of its proper divisors (43022040).

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

19797240 is a wasteful number, since it uses less digits than its factorization.

19797240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 19797240 is about 4449.4089495123. The cubic root of 19797240 is about 270.5213520523.

The spelling of 19797240 in words is "nineteen million, seven hundred ninety-seven thousand, two hundred forty".