19797040 has 20 divisors (see below), whose sum is σ = 46028304. Its totient is φ = 7918784.

The previous prime is 19797023. The next prime is 19797047. The reversal of 19797040 is 4079791.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (19797047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123652 + ... + 123811.

Almost surely, 2^19797040 is an apocalyptic number.

19797040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19797040 is an abundant number, since it is smaller than the sum of its proper divisors (26231264).

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

19797040 is a wasteful number, since it uses less digits than its factorization.

19797040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247476 (or 247470 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 19797040 is about 4449.3864745603. The cubic root of 19797040 is about 270.5204410760.

The spelling of 19797040 in words is "nineteen million, seven hundred ninety-seven thousand, forty".