20271006 has 96 divisors (see below), whose sum is σ = 53844480. Its totient is φ = 5633712.

The previous prime is 20270989. The next prime is 20271037. The reversal of 20271006 is 60017202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20271006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124281 + ... + 124443.

It is an arithmetic number, because the mean of its divisors is an integer number (560880).

Almost surely, 2^20271006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20271006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26922240).

20271006 is an abundant number, since it is smaller than the sum of its proper divisors (33573474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20271006 is a wasteful number, since it uses less digits than its factorization.

20271006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20271006 is about 4502.3333950297. Note that the first 4 decimals coincide. The cubic root of 20271006 is about 272.6623043428.

Adding to 20271006 its reverse (60017202), we get a palindrome (80288208).

The spelling of 20271006 in words is "twenty million, two hundred seventy-one thousand, six".