20407071 has 8 divisors (see below), whose sum is σ = 27788544. Its totient is φ = 13315160.

The previous prime is 20407031. The next prime is 20407099. The reversal of 20407071 is 17070402.

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 20407071 - 2⁹ = 20406559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20407031) 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, 72225 + ... + 72506.

It is an arithmetic number, because the mean of its divisors is an integer number (3473568).

Almost surely, 2^20407071 is an apocalyptic number.

20407071 is a deficient number, since it is larger than the sum of its proper divisors (7381473).

20407071 is a wasteful number, since it uses less digits than its factorization.

20407071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144781.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 20407071 is about 4517.4186212925. The cubic root of 20407071 is about 273.2710078334.

Adding to 20407071 its reverse (17070402), we get a palindrome (37477473).

The spelling of 20407071 in words is "twenty million, four hundred seven thousand, seventy-one".