20968841 has 2 divisors, whose sum is σ = 20968842. Its totient is φ = 20968840.

The previous prime is 20968817. The next prime is 20968853. The reversal of 20968841 is 14886902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20967241 + 1600 = 4579^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 20968841 - 2¹⁴ = 20952457 is a prime.

It is a super-3 number, since 3×20968841³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20968795 and 20968804.

It is not a weakly prime, because it can be changed into another prime (20968141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10484420 + 10484421.

It is an arithmetic number, because the mean of its divisors is an integer number (10484421).

Almost surely, 2^20968841 is an apocalyptic number.

It is an amenable number.

20968841 is a deficient number, since it is larger than the sum of its proper divisors (1).

20968841 is an equidigital number, since it uses as much as digits as its factorization.

20968841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 20968841 is about 4579.1747073026. The cubic root of 20968841 is about 275.7558972082.

The spelling of 20968841 in words is "twenty million, nine hundred sixty-eight thousand, eight hundred forty-one".