20755447 has 2 divisors, whose sum is σ = 20755448. Its totient is φ = 20755446.

The previous prime is 20755421. The next prime is 20755457. The reversal of 20755447 is 74455702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20755447 - 2²³ = 12366839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20755417) 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, 10377723 + 10377724.

It is an arithmetic number, because the mean of its divisors is an integer number (10377724).

Almost surely, 2^20755447 is an apocalyptic number.

20755447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20755447 is an equidigital number, since it uses as much as digits as its factorization.

20755447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39200, while the sum is 34.

The square root of 20755447 is about 4555.8146362643. The cubic root of 20755447 is about 274.8172758608.

The spelling of 20755447 in words is "twenty million, seven hundred fifty-five thousand, four hundred forty-seven".