19685040 has 40 divisors (see below), whose sum is σ = 61024368. Its totient is φ = 5249280.

The previous prime is 19685023. The next prime is 19685053. The reversal of 19685040 is 4058691.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 19684992 and 19685010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40771 + ... + 41250.

Almost surely, 2^19685040 is an apocalyptic number.

19685040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19685040 is an abundant number, since it is smaller than the sum of its proper divisors (41339328).

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

19685040 is a wasteful number, since it uses less digits than its factorization.

19685040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82037 (or 82031 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 19685040 is about 4436.7826180691. The cubic root of 19685040 is about 270.0093275241.

The spelling of 19685040 in words is "nineteen million, six hundred eighty-five thousand, forty".