20841913 has 2 divisors, whose sum is σ = 20841914. Its totient is φ = 20841912.

The previous prime is 20841911. The next prime is 20841937. The reversal of 20841913 is 31914802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 157609 = 4548^2 + 397^2 .

It is a cyclic number.

It is not a de Polignac number, because 20841913 - 2¹ = 20841911 is a prime.

Together with 20841911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20841911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420956 + 10420957.

It is an arithmetic number, because the mean of its divisors is an integer number (10420957).

Almost surely, 2^20841913 is an apocalyptic number.

It is an amenable number.

20841913 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841913 is an equidigital number, since it uses as much as digits as its factorization.

20841913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20841913 is about 4565.2944045264. The cubic root of 20841913 is about 275.1983714707.

The spelling of 20841913 in words is "twenty million, eight hundred forty-one thousand, nine hundred thirteen".