19927440 has 120 divisors (see below), whose sum is σ = 72104760. Its totient is φ = 4902912.

The previous prime is 19927433. The next prime is 19927471. The reversal of 19927440 is 4472991.

19927440 is a `hidden beast` number, since 199 + 27 + 440 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 144 + 19927296 = 12^2 + 4464^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19927395 and 19927404.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8296 + ... + 10424.

It is an arithmetic number, because the mean of its divisors is an integer number (600873).

Almost surely, 2^19927440 is an apocalyptic number.

19927440 is a gapful number since it is divisible by the number (10) 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 19927440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36052380).

19927440 is an abundant number, since it is smaller than the sum of its proper divisors (52177320).

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

19927440 is a wasteful number, since it uses less digits than its factorization.

19927440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161 (or 2152 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 19927440 is about 4464.0161290031. The cubic root of 19927440 is about 271.1131003069.

The spelling of 19927440 in words is "nineteen million, nine hundred twenty-seven thousand, four hundred forty".