20741551 has 2 divisors, whose sum is σ = 20741552. Its totient is φ = 20741550.

The previous prime is 20741537. The next prime is 20741569. The reversal of 20741551 is 15514702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20741551 - 2¹³ = 20733359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20742551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370775 + 10370776.

It is an arithmetic number, because the mean of its divisors is an integer number (10370776).

Almost surely, 2^20741551 is an apocalyptic number.

20741551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20741551 is an equidigital number, since it uses as much as digits as its factorization.

20741551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 20741551 is about 4554.2892969156. The cubic root of 20741551 is about 274.7559311057.

The spelling of 20741551 in words is "twenty million, seven hundred forty-one thousand, five hundred fifty-one".