19420506 has 64 divisors (see below), whose sum is σ = 49996800. Its totient is φ = 5473008.

The previous prime is 19420501. The next prime is 19420537. The reversal of 19420506 is 60502491.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19420506.

It is not an unprimeable number, because it can be changed into a prime (19420501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31065 + ... + 31683.

It is an arithmetic number, because the mean of its divisors is an integer number (781200).

Almost surely, 2^19420506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19420506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24998400).

19420506 is an abundant number, since it is smaller than the sum of its proper divisors (30576294).

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

19420506 is a wasteful number, since it uses less digits than its factorization.

19420506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 19420506 is about 4406.8703180375. The cubic root of 19420506 is about 268.7943776726.

Adding to 19420506 its reverse (60502491), we get a palindrome (79922997).

The spelling of 19420506 in words is "nineteen million, four hundred twenty thousand, five hundred six".