20387267 has 8 divisors (see below), whose sum is σ = 21683376. Its totient is φ = 19101952.

The previous prime is 20387249. The next prime is 20387287. The reversal of 20387267 is 76278302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20387267 - 2¹⁰ = 20386243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20387287) 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 7 ways as a sum of consecutive naturals, for example, 1388 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (2710422).

Almost surely, 2^20387267 is an apocalyptic number.

20387267 is a deficient number, since it is larger than the sum of its proper divisors (1296109).

20387267 is a wasteful number, since it uses less digits than its factorization.

20387267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5397.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 20387267 is about 4515.2261294425. The cubic root of 20387267 is about 273.1825807938.

The spelling of 20387267 in words is "twenty million, three hundred eighty-seven thousand, two hundred sixty-seven".