20367971 has 4 divisors (see below), whose sum is σ = 21934752. Its totient is φ = 18801192.

The previous prime is 20367923. The next prime is 20367973. The reversal of 20367971 is 17976302.

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

It is a cyclic number.

It is not a de Polignac number, because 20367971 - 2¹⁴ = 20351587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20367973) 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, 783371 + ... + 783396.

It is an arithmetic number, because the mean of its divisors is an integer number (5483688).

Almost surely, 2^20367971 is an apocalyptic number.

20367971 is a deficient number, since it is larger than the sum of its proper divisors (1566781).

20367971 is a wasteful number, since it uses less digits than its factorization.

20367971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566780.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 20367971 is about 4513.0888535459. The cubic root of 20367971 is about 273.0963669327.

The spelling of 20367971 in words is "twenty million, three hundred sixty-seven thousand, nine hundred seventy-one".