19706428 has 36 divisors (see below), whose sum is σ = 41511960. Its totient is φ = 8152032.

The previous prime is 19706419. The next prime is 19706443. The reversal of 19706428 is 82460791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3951 + ... + 7417.

It is an arithmetic number, because the mean of its divisors is an integer number (1153110).

Almost surely, 2^19706428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19706428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20755980).

19706428 is an abundant number, since it is smaller than the sum of its proper divisors (21805532).

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

19706428 is a wasteful number, since it uses less digits than its factorization.

19706428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514 (or 3505 counting only the distinct ones).

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

The square root of 19706428 is about 4439.1922688705. The cubic root of 19706428 is about 270.1070814401.

The spelling of 19706428 in words is "nineteen million, seven hundred six thousand, four hundred twenty-eight".