20331907 has 4 divisors (see below), whose sum is σ = 20881456. Its totient is φ = 19782360.

The previous prime is 20331901. The next prime is 20331917. The reversal of 20331907 is 70913302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20331901) 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, 274719 + ... + 274792.

It is an arithmetic number, because the mean of its divisors is an integer number (5220364).

Almost surely, 2^20331907 is an apocalyptic number.

20331907 is a deficient number, since it is larger than the sum of its proper divisors (549549).

20331907 is an equidigital number, since it uses as much as digits as its factorization.

20331907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549548.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 20331907 is about 4509.0915936583. The cubic root of 20331907 is about 272.9350881284.

The spelling of 20331907 in words is "twenty million, three hundred thirty-one thousand, nine hundred seven".