19706540 has 24 divisors (see below), whose sum is σ = 47296032. Its totient is φ = 6756480.

The previous prime is 19706521. The next prime is 19706543. The reversal of 19706540 is 4560791.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19706497 and 19706506.

It is not an unprimeable number, because it can be changed into a prime (19706543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70241 + ... + 70520.

It is an arithmetic number, because the mean of its divisors is an integer number (1970668).

Almost surely, 2^19706540 is an apocalyptic number.

19706540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19706540 is an abundant number, since it is smaller than the sum of its proper divisors (27589492).

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

19706540 is a wasteful number, since it uses less digits than its factorization.

19706540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140777 (or 140775 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 19706540 is about 4439.2048837602. The cubic root of 19706540 is about 270.1075931503.

The spelling of 19706540 in words is "nineteen million, seven hundred six thousand, five hundred forty".