20868941 has 2 divisors, whose sum is σ = 20868942. Its totient is φ = 20868940.

The previous prime is 20868937. The next prime is 20868943. The reversal of 20868941 is 14986802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 1110916 = 4445^2 + 1054^2 .

It is a cyclic number.

It is not a de Polignac number, because 20868941 - 2² = 20868937 is a prime.

It is a super-2 number, since 2×20868941² = 871025396922962, which contains 22 as substring.

Together with 20868943, 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 = 20868895 and 20868904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20868943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434470 + 10434471.

It is an arithmetic number, because the mean of its divisors is an integer number (10434471).

Almost surely, 2^20868941 is an apocalyptic number.

It is an amenable number.

20868941 is a deficient number, since it is larger than the sum of its proper divisors (1).

20868941 is an equidigital number, since it uses as much as digits as its factorization.

20868941 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 20868941 is about 4568.2536050443. The cubic root of 20868941 is about 275.3172800797.

The spelling of 20868941 in words is "twenty million, eight hundred sixty-eight thousand, nine hundred forty-one".