20818071 has 12 divisors (see below), whose sum is σ = 30117672. Its totient is φ = 13856976.

The previous prime is 20818009. The next prime is 20818073. The reversal of 20818071 is 17081802.

It is not a de Polignac number, because 20818071 - 2²³ = 12429463 is a prime.

It is a super-2 number, since 2×20818071² = 866784160322082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818073) 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, 6045 + ... + 8841.

It is an arithmetic number, because the mean of its divisors is an integer number (2509806).

Almost surely, 2^20818071 is an apocalyptic number.

20818071 is a deficient number, since it is larger than the sum of its proper divisors (9299601).

20818071 is a wasteful number, since it uses less digits than its factorization.

20818071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3630 (or 3627 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 20818071 is about 4562.6824347088. The cubic root of 20818071 is about 275.0933941736.

Adding to 20818071 its reverse (17081802), we get a palindrome (37899873).

The spelling of 20818071 in words is "twenty million, eight hundred eighteen thousand, seventy-one".