20670427 has 2 divisors, whose sum is σ = 20670428. Its totient is φ = 20670426.

The previous prime is 20670421. The next prime is 20670431. The reversal of 20670427 is 72407602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20670427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20670395 and 20670404.

It is not a weakly prime, because it can be changed into another prime (20670421) 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, 10335213 + 10335214.

It is an arithmetic number, because the mean of its divisors is an integer number (10335214).

Almost surely, 2^20670427 is an apocalyptic number.

20670427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670427 is an equidigital number, since it uses as much as digits as its factorization.

20670427 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 20670427 is about 4546.4741283768. The cubic root of 20670427 is about 274.4415200299.

The spelling of 20670427 in words is "twenty million, six hundred seventy thousand, four hundred twenty-seven".