20942741 has 2 divisors, whose sum is σ = 20942742. Its totient is φ = 20942740.

The previous prime is 20942723. The next prime is 20942749. The reversal of 20942741 is 14724902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 3960100 = 4121^2 + 1990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20942741 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20942749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471370 + 10471371.

It is an arithmetic number, because the mean of its divisors is an integer number (10471371).

Almost surely, 2^20942741 is an apocalyptic number.

It is an amenable number.

20942741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20942741 is an equidigital number, since it uses as much as digits as its factorization.

20942741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20942741 is about 4576.3239614345. The cubic root of 20942741 is about 275.6414382176.

The spelling of 20942741 in words is "twenty million, nine hundred forty-two thousand, seven hundred forty-one".