20746507 has 2 divisors, whose sum is σ = 20746508. Its totient is φ = 20746506.

The previous prime is 20746501. The next prime is 20746519. The reversal of 20746507 is 70564702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20746507 - 2⁷ = 20746379 is a prime.

It is not a weakly prime, because it can be changed into another prime (20746501) 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, 10373253 + 10373254.

It is an arithmetic number, because the mean of its divisors is an integer number (10373254).

Almost surely, 2^20746507 is an apocalyptic number.

20746507 is a deficient number, since it is larger than the sum of its proper divisors (1).

20746507 is an equidigital number, since it uses as much as digits as its factorization.

20746507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 20746507 is about 4554.8333668752. The cubic root of 20746507 is about 274.7778128180. Note that the first 3 decimals are identical.

The spelling of 20746507 in words is "twenty million, seven hundred forty-six thousand, five hundred seven".