20355847 has 2 divisors, whose sum is σ = 20355848. Its totient is φ = 20355846.

The previous prime is 20355827. The next prime is 20355877. The reversal of 20355847 is 74855302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20355847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20355827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177923 + 10177924.

It is an arithmetic number, because the mean of its divisors is an integer number (10177924).

Almost surely, 2^20355847 is an apocalyptic number.

20355847 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355847 is an equidigital number, since it uses as much as digits as its factorization.

20355847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 20355847 is about 4511.7454493799. The cubic root of 20355847 is about 273.0421694621.

The spelling of 20355847 in words is "twenty million, three hundred fifty-five thousand, eight hundred forty-seven".