20667371 has 4 divisors (see below), whose sum is σ = 20860632. Its totient is φ = 20474112.

The previous prime is 20667331. The next prime is 20667373. The reversal of 20667371 is 17376602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20667371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20667373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96470 + ... + 96683.

It is an arithmetic number, because the mean of its divisors is an integer number (5215158).

Almost surely, 2^20667371 is an apocalyptic number.

20667371 is a deficient number, since it is larger than the sum of its proper divisors (193261).

20667371 is a wasteful number, since it uses less digits than its factorization.

20667371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193260.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20667371 is about 4546.1380313404. The cubic root of 20667371 is about 274.4279945132.

The spelling of 20667371 in words is "twenty million, six hundred sixty-seven thousand, three hundred seventy-one".