19681542 has 28 divisors (see below), whose sum is σ = 44266500. Its totient is φ = 6560028.

The previous prime is 19681531. The next prime is 19681547. The reversal of 19681542 is 24518691.

It is a junction number, because it is equal to n+sod(n) for n = 19681497 and 19681506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19681547) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 5292 + ... + 8207.

Almost surely, 2^19681542 is an apocalyptic number.

19681542 is an abundant number, since it is smaller than the sum of its proper divisors (24584958).

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

19681542 is an equidigital number, since it uses as much as digits as its factorization.

19681542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13519 (or 13504 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 19681542 is about 4436.3883959816. The cubic root of 19681542 is about 269.9933331687.

The spelling of 19681542 in words is "nineteen million, six hundred eighty-one thousand, five hundred forty-two".