19947141 has 48 divisors (see below), whose sum is σ = 32288256. Its totient is φ = 12274416.

The previous prime is 19947139. The next prime is 19947143. The reversal of 19947141 is 14174991.

It is an interprime number because it is at equal distance from previous prime (19947139) and next prime (19947143).

It is not a de Polignac number, because 19947141 - 2¹ = 19947139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19947096 and 19947105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19947143) 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 47 ways as a sum of consecutive naturals, for example, 240286 + ... + 240368.

It is an arithmetic number, because the mean of its divisors is an integer number (672672).

Almost surely, 2^19947141 is an apocalyptic number.

It is an amenable number.

19947141 is a deficient number, since it is larger than the sum of its proper divisors (12341115).

19947141 is an equidigital number, since it uses as much as digits as its factorization.

19947141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 152 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 19947141 is about 4466.2222291328. Note that the first 5 decimals coincide. The cubic root of 19947141 is about 271.2024150071.

The spelling of 19947141 in words is "nineteen million, nine hundred forty-seven thousand, one hundred forty-one".