20307387 has 16 divisors (see below), whose sum is σ = 28431360. Its totient is φ = 12876000.

The previous prime is 20307379. The next prime is 20307403. The reversal of 20307387 is 78370302.

It is not a de Polignac number, because 20307387 - 2³ = 20307379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20307307) 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 15 ways as a sum of consecutive naturals, for example, 3637 + ... + 7337.

It is an arithmetic number, because the mean of its divisors is an integer number (1776960).

Almost surely, 2^20307387 is an apocalyptic number.

20307387 is a deficient number, since it is larger than the sum of its proper divisors (8123973).

20307387 is a wasteful number, since it uses less digits than its factorization.

20307387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 20307387 is about 4506.3718222091. The cubic root of 20307387 is about 272.8253253392.

Adding to 20307387 its reverse (78370302), we get a palindrome (98677689).

The spelling of 20307387 in words is "twenty million, three hundred seven thousand, three hundred eighty-seven".