20187393 has 16 divisors (see below), whose sum is σ = 28442880. Its totient is φ = 12715136.

The previous prime is 20187383. The next prime is 20187397. The reversal of 20187393 is 39378102.

It is a cyclic number.

It is not a de Polignac number, because 20187393 - 2⁸ = 20187137 is a prime.

It is a super-2 number, since 2×20187393² = 815061672272898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20187397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1621 + ... + 6557.

It is an arithmetic number, because the mean of its divisors is an integer number (1777680).

Almost surely, 2^20187393 is an apocalyptic number.

It is an amenable number.

20187393 is a deficient number, since it is larger than the sum of its proper divisors (8255487).

20187393 is a wasteful number, since it uses less digits than its factorization.

20187393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20187393 is about 4493.0382816086. The cubic root of 20187393 is about 272.2868990168.

The spelling of 20187393 in words is "twenty million, one hundred eighty-seven thousand, three hundred ninety-three".