20522741 has 2 divisors, whose sum is σ = 20522742. Its totient is φ = 20522740.

The previous prime is 20522731. The next prime is 20522743. The reversal of 20522741 is 14722502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 532900 = 4471^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522741 - 2²² = 16328437 is a prime.

It is a Sophie Germain prime.

Together with 20522743, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20522743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261370 + 10261371.

It is an arithmetic number, because the mean of its divisors is an integer number (10261371).

Almost surely, 2^20522741 is an apocalyptic number.

It is an amenable number.

20522741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20522741 is an equidigital number, since it uses as much as digits as its factorization.

20522741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20522741 is about 4530.2031963257. The cubic root of 20522741 is about 273.7863475572.

Subtracting from 20522741 its product of nonzero digits (1120), we obtain a triangular number (20521621 = T₆₄₀₆).

The spelling of 20522741 in words is "twenty million, five hundred twenty-two thousand, seven hundred forty-one".