20746387 has 2 divisors, whose sum is σ = 20746388. Its totient is φ = 20746386.

The previous prime is 20746379. The next prime is 20746393. The reversal of 20746387 is 78364702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20746387 - 2³ = 20746379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20746367) 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, 10373193 + 10373194.

It is an arithmetic number, because the mean of its divisors is an integer number (10373194).

Almost surely, 2^20746387 is an apocalyptic number.

20746387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20746387 is an equidigital number, since it uses as much as digits as its factorization.

20746387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 20746387 is about 4554.8201940362. The cubic root of 20746387 is about 274.7772830356. Note that the first 3 decimals are identical.

The spelling of 20746387 in words is "twenty million, seven hundred forty-six thousand, three hundred eighty-seven".