20916941 has 2 divisors, whose sum is σ = 20916942. Its totient is φ = 20916940.

The previous prime is 20916937. The next prime is 20916943. The reversal of 20916941 is 14961902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20884900 + 32041 = 4570^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 20916941 - 2² = 20916937 is a prime.

Together with 20916943, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20916898 and 20916907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20916943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10458470 + 10458471.

It is an arithmetic number, because the mean of its divisors is an integer number (10458471).

Almost surely, 2^20916941 is an apocalyptic number.

It is an amenable number.

20916941 is a deficient number, since it is larger than the sum of its proper divisors (1).

20916941 is an equidigital number, since it uses as much as digits as its factorization.

20916941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20916941 is about 4573.5042363597. The cubic root of 20916941 is about 275.5282013461.

The spelling of 20916941 in words is "twenty million, nine hundred sixteen thousand, nine hundred forty-one".