20727231 has 16 divisors (see below), whose sum is σ = 32121600. Its totient is φ = 11642688.

The previous prime is 20727227. The next prime is 20727253. The reversal of 20727231 is 13272702.

It is not a de Polignac number, because 20727231 - 2² = 20727227 is a prime.

It is a super-2 number, since 2×20727231² = 859236209854722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20727281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7126 + ... + 9603.

It is an arithmetic number, because the mean of its divisors is an integer number (2007600).

Almost surely, 2^20727231 is an apocalyptic number.

20727231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20727231 is a deficient number, since it is larger than the sum of its proper divisors (11394369).

20727231 is a wasteful number, since it uses less digits than its factorization.

20727231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16798.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 20727231 is about 4552.7168811601. The cubic root of 20727231 is about 274.6926859037.

Adding to 20727231 its reverse (13272702), we get a palindrome (33999933).

The spelling of 20727231 in words is "twenty million, seven hundred twenty-seven thousand, two hundred thirty-one".