20147441 has 6 divisors (see below), whose sum is σ = 20668326. Its totient is φ = 19628000.

The previous prime is 20147437. The next prime is 20147447. The reversal of 20147441 is 14474102.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4906225 + 15241216 = 2215^2 + 3904^2 .

It is not a de Polignac number, because 20147441 - 2² = 20147437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20147447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28391 + ... + 29091.

It is an arithmetic number, because the mean of its divisors is an integer number (3444721).

Almost surely, 2^20147441 is an apocalyptic number.

It is an amenable number.

20147441 is a deficient number, since it is larger than the sum of its proper divisors (520885).

20147441 is an frugal number, since it uses more digits than its factorization.

20147441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20147441 is about 4488.5900904404. The cubic root of 20147441 is about 272.1071566330.

The spelling of 20147441 in words is "twenty million, one hundred forty-seven thousand, four hundred forty-one".