20351071 has 8 divisors (see below), whose sum is σ = 23070320. Its totient is φ = 17796672.

The previous prime is 20351053. The next prime is 20351077. The reversal of 20351071 is 17015302.

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

It is a cyclic number.

It is not a de Polignac number, because 20351071 - 2⁹ = 20350559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351077) 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 7 ways as a sum of consecutive naturals, for example, 40950 + ... + 41443.

It is an arithmetic number, because the mean of its divisors is an integer number (2883790).

Almost surely, 2^20351071 is an apocalyptic number.

20351071 is a deficient number, since it is larger than the sum of its proper divisors (2719249).

20351071 is a wasteful number, since it uses less digits than its factorization.

20351071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82425.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20351071 is about 4511.2161331508. The cubic root of 20351071 is about 273.0208135768.

Adding to 20351071 its reverse (17015302), we get a palindrome (37366373).

The spelling of 20351071 in words is "twenty million, three hundred fifty-one thousand, seventy-one".