20713447 has 2 divisors, whose sum is σ = 20713448. Its totient is φ = 20713446.

The previous prime is 20713411. The next prime is 20713457. The reversal of 20713447 is 74431702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20713447 - 2¹¹ = 20711399 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20713457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356723 + 10356724.

It is an arithmetic number, because the mean of its divisors is an integer number (10356724).

Almost surely, 2^20713447 is an apocalyptic number.

20713447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20713447 is an equidigital number, since it uses as much as digits as its factorization.

20713447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 20713447 is about 4551.2028080498. The cubic root of 20713447 is about 274.6317804596.

The spelling of 20713447 in words is "twenty million, seven hundred thirteen thousand, four hundred forty-seven".