19945536 has 112 divisors (see below), whose sum is σ = 58204608. Its totient is φ = 5990400.

The previous prime is 19945511. The next prime is 19945537. The reversal of 19945536 is 63554991.

It is not an unprimeable number, because it can be changed into a prime (19945537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152191 + ... + 152321.

It is an arithmetic number, because the mean of its divisors is an integer number (519684).

Almost surely, 2^19945536 is an apocalyptic number.

19945536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19945536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29102304).

19945536 is an abundant number, since it is smaller than the sum of its proper divisors (38259072).

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

19945536 is a wasteful number, since it uses less digits than its factorization.

19945536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 210 counting only the distinct ones).

The product of its digits is 145800, while the sum is 42.

The square root of 19945536 is about 4466.0425434606. The cubic root of 19945536 is about 271.1951409229.

The spelling of 19945536 in words is "nineteen million, nine hundred forty-five thousand, five hundred thirty-six".