20627471 has 2 divisors, whose sum is σ = 20627472. Its totient is φ = 20627470.

The previous prime is 20627449. The next prime is 20627473. The reversal of 20627471 is 17472602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20627471 - 2¹⁰ = 20626447 is a prime.

It is a super-3 number, since 3×20627471³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 20627473, 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 (20627473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10313735 + 10313736.

It is an arithmetic number, because the mean of its divisors is an integer number (10313736).

Almost surely, 2^20627471 is an apocalyptic number.

20627471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20627471 is an equidigital number, since it uses as much as digits as its factorization.

20627471 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 29.

The square root of 20627471 is about 4541.7475711448. The cubic root of 20627471 is about 274.2512790687.

The spelling of 20627471 in words is "twenty million, six hundred twenty-seven thousand, four hundred seventy-one".