20215071 has 12 divisors (see below), whose sum is σ = 29240848. Its totient is φ = 13457664.

The previous prime is 20215037. The next prime is 20215093. The reversal of 20215071 is 17051202.

It is not a de Polignac number, because 20215071 - 2¹⁵ = 20182303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8511 + ... + 10623.

Almost surely, 2^20215071 is an apocalyptic number.

20215071 is a deficient number, since it is larger than the sum of its proper divisors (9025777).

20215071 is a wasteful number, since it uses less digits than its factorization.

20215071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182 (or 3179 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 20215071 is about 4496.1173249816. The cubic root of 20215071 is about 272.4112821761.

Adding to 20215071 its reverse (17051202), we get a palindrome (37266273).

The spelling of 20215071 in words is "twenty million, two hundred fifteen thousand, seventy-one".