19742608 has 20 divisors (see below), whose sum is σ = 39286300. Its totient is φ = 9604224.

The previous prime is 19742599. The next prime is 19742609. The reversal of 19742608 is 80624791.

It can be written as a sum of positive squares in 2 ways, for example, as 18558864 + 1183744 = 4308^2 + 1088^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19742609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16083 + ... + 17266.

It is an arithmetic number, because the mean of its divisors is an integer number (1964315).

Almost surely, 2^19742608 is an apocalyptic number.

It is an amenable number.

19742608 is a deficient number, since it is larger than the sum of its proper divisors (19543692).

19742608 is a wasteful number, since it uses less digits than its factorization.

19742608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33394 (or 33388 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 19742608 is about 4443.2654658483. The cubic root of 19742608 is about 270.2722813385.

The spelling of 19742608 in words is "nineteen million, seven hundred forty-two thousand, six hundred eight".