20009071 has 8 divisors (see below), whose sum is σ = 21225600. Its totient is φ = 18808920.

The previous prime is 20009053. The next prime is 20009113. The reversal of 20009071 is 17090002.

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 20009071 - 2⁹ = 20008559 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20009371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1531 + ... + 6508.

It is an arithmetic number, because the mean of its divisors is an integer number (2653200).

Almost surely, 2^20009071 is an apocalyptic number.

20009071 is a deficient number, since it is larger than the sum of its proper divisors (1216529).

20009071 is a wasteful number, since it uses less digits than its factorization.

20009071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8189.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 20009071 is about 4473.1500086628. The cubic root of 20009071 is about 271.4827929272.

Adding to 20009071 its reverse (17090002), we get a palindrome (37099073).

The spelling of 20009071 in words is "twenty million, nine thousand, seventy-one".