20746667 has 4 divisors (see below), whose sum is σ = 21648720. Its totient is φ = 19844616.

The previous prime is 20746639. The next prime is 20746709. The reversal of 20746667 is 76664702.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76664702 = 2 ⋅38332351.

It is a cyclic number.

It is not a de Polignac number, because 20746667 - 2¹⁸ = 20484523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20746667.

It is not an unprimeable number, because it can be changed into a prime (20746067) 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 in 3 ways as a sum of consecutive naturals, for example, 450992 + ... + 451037.

It is an arithmetic number, because the mean of its divisors is an integer number (5412180).

Almost surely, 2^20746667 is an apocalyptic number.

20746667 is a deficient number, since it is larger than the sum of its proper divisors (902053).

20746667 is an equidigital number, since it uses as much as digits as its factorization.

20746667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902052.

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 20746667 is about 4554.8509306014. The cubic root of 20746667 is about 274.7785191913.

The spelling of 20746667 in words is "twenty million, seven hundred forty-six thousand, six hundred sixty-seven".