20908427 has 2 divisors, whose sum is σ = 20908428. Its totient is φ = 20908426.

The previous prime is 20908423. The next prime is 20908451. The reversal of 20908427 is 72480902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20908427 - 2² = 20908423 is a prime.

It is a super-2 number, since 2×20908427² = 874324639228658, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20908393 and 20908402.

It is not a weakly prime, because it can be changed into another prime (20908423) 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, 10454213 + 10454214.

It is an arithmetic number, because the mean of its divisors is an integer number (10454214).

Almost surely, 2^20908427 is an apocalyptic number.

20908427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908427 is an equidigital number, since it uses as much as digits as its factorization.

20908427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20908427 is about 4572.5733455025. The cubic root of 20908427 is about 275.4908127454.

The spelling of 20908427 in words is "twenty million, nine hundred eight thousand, four hundred twenty-seven".