20691441 has 6 divisors (see below), whose sum is σ = 29887650. Its totient is φ = 13794288.

The previous prime is 20691439. The next prime is 20691457. The reversal of 20691441 is 14419602.

It can be written as a sum of positive squares in only one way, i.e., 12047841 + 8643600 = 3471^2 + 2940^2 .

It is not a de Polignac number, because 20691441 - 2¹ = 20691439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20690441) 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, 1149516 + ... + 1149533.

It is an arithmetic number, because the mean of its divisors is an integer number (4981275).

Almost surely, 2^20691441 is an apocalyptic number.

It is an amenable number.

20691441 is a deficient number, since it is larger than the sum of its proper divisors (9196209).

20691441 is a wasteful number, since it uses less digits than its factorization.

20691441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299055 (or 2299052 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20691441 is about 4548.7845629355. The cubic root of 20691441 is about 274.5344895798.

The spelling of 20691441 in words is "twenty million, six hundred ninety-one thousand, four hundred forty-one".