20330909251 has 4 divisors (see below), whose sum is σ = 20344903072. Its totient is φ = 20316915432.

The previous prime is 20330909243. The next prime is 20330909257. The reversal of 20330909251 is 15290903302.

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

It is a cyclic number.

It is not a de Polignac number, because 20330909251 - 2³ = 20330909243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20330909257) 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 3 ways as a sum of consecutive naturals, for example, 6994731 + ... + 6997636.

It is an arithmetic number, because the mean of its divisors is an integer number (5086225768).

Almost surely, 2^20330909251 is an apocalyptic number.

20330909251 is a deficient number, since it is larger than the sum of its proper divisors (13993821).

20330909251 is a wasteful number, since it uses less digits than its factorization.

20330909251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13993820.

The product of its (nonzero) digits is 14580, while the sum is 34.

The spelling of 20330909251 in words is "twenty billion, three hundred thirty million, nine hundred nine thousand, two hundred fifty-one".