20666367 has 16 divisors (see below), whose sum is σ = 31605760. Its totient is φ = 13332600.

The previous prime is 20666363. The next prime is 20666369. The reversal of 20666367 is 76366602.

It is not a de Polignac number, because 20666367 - 2² = 20666363 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11509 + ... + 13182.

It is an arithmetic number, because the mean of its divisors is an integer number (1975360).

Almost surely, 2^20666367 is an apocalyptic number.

20666367 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20666367 is a deficient number, since it is larger than the sum of its proper divisors (10939393).

20666367 is a wasteful number, since it uses less digits than its factorization.

20666367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24731 (or 24725 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 20666367 is about 4546.0276066034. The cubic root of 20666367 is about 274.4235506297.

The spelling of 20666367 in words is "twenty million, six hundred sixty-six thousand, three hundred sixty-seven".