20138307 has 8 divisors (see below), whose sum is σ = 30686976. Its totient is φ = 11507592.

The previous prime is 20138303. The next prime is 20138311. The reversal of 20138307 is 70383102.

It is an interprime number because it is at equal distance from previous prime (20138303) and next prime (20138311).

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

It is not a de Polignac number, because 20138307 - 2² = 20138303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20138303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 479463 + ... + 479504.

It is an arithmetic number, because the mean of its divisors is an integer number (3835872).

Almost surely, 2^20138307 is an apocalyptic number.

20138307 is a deficient number, since it is larger than the sum of its proper divisors (10548669).

20138307 is an equidigital number, since it uses as much as digits as its factorization.

20138307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958977.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20138307 is about 4487.5725063780. The cubic root of 20138307 is about 272.0660297812.

The spelling of 20138307 in words is "twenty million, one hundred thirty-eight thousand, three hundred seven".