20745667 has 2 divisors, whose sum is σ = 20745668. Its totient is φ = 20745666.

The previous prime is 20745649. The next prime is 20745691. The reversal of 20745667 is 76654702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20745667 - 2¹⁹ = 20221379 is a prime.

It is not a weakly prime, because it can be changed into another prime (20725667) 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, 10372833 + 10372834.

It is an arithmetic number, because the mean of its divisors is an integer number (10372834).

Almost surely, 2^20745667 is an apocalyptic number.

20745667 is a deficient number, since it is larger than the sum of its proper divisors (1).

20745667 is an equidigital number, since it uses as much as digits as its factorization.

20745667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 20745667 is about 4554.7411562020. The cubic root of 20745667 is about 274.7741042985.

It can be divided in two parts, 20745 and 667, that added together give a palindrome (21412).

The spelling of 20745667 in words is "twenty million, seven hundred forty-five thousand, six hundred sixty-seven".