20829841 has 2 divisors, whose sum is σ = 20829842. Its totient is φ = 20829840.

The previous prime is 20829839. The next prime is 20829857. The reversal of 20829841 is 14892802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 3690241 = 4140^2 + 1921^2 .

It is a cyclic number.

It is not a de Polignac number, because 20829841 - 2¹ = 20829839 is a prime.

Together with 20829839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20829797 and 20829806.

It is not a weakly prime, because it can be changed into another prime (20829821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10414920 + 10414921.

It is an arithmetic number, because the mean of its divisors is an integer number (10414921).

Almost surely, 2^20829841 is an apocalyptic number.

It is an amenable number.

20829841 is a deficient number, since it is larger than the sum of its proper divisors (1).

20829841 is an equidigital number, since it uses as much as digits as its factorization.

20829841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 20829841 is about 4563.9720638935. The cubic root of 20829841 is about 275.1452279746.

The spelling of 20829841 in words is "twenty million, eight hundred twenty-nine thousand, eight hundred forty-one".