20531741 has 2 divisors, whose sum is σ = 20531742. Its totient is φ = 20531740.

The previous prime is 20531717. The next prime is 20531743. The reversal of 20531741 is 14713502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11356900 + 9174841 = 3370^2 + 3029^2 .

It is a cyclic number.

It is not a de Polignac number, because 20531741 - 2¹⁴ = 20515357 is a prime.

Together with 20531743, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20531743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265870 + 10265871.

It is an arithmetic number, because the mean of its divisors is an integer number (10265871).

Almost surely, 2^20531741 is an apocalyptic number.

It is an amenable number.

20531741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531741 is an equidigital number, since it uses as much as digits as its factorization.

20531741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20531741 is about 4531.1964203729. The cubic root of 20531741 is about 273.8263636061.

The spelling of 20531741 in words is "twenty million, five hundred thirty-one thousand, seven hundred forty-one".