20827231 has 4 divisors (see below), whose sum is σ = 20848464. Its totient is φ = 20806000.

The previous prime is 20827199. The next prime is 20827241. The reversal of 20827231 is 13272802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20827231 - 2⁵ = 20827199 is a prime.

It is a super-2 number, since 2×20827231² = 867547102254722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20827196 and 20827205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20827241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9070 + ... + 11131.

It is an arithmetic number, because the mean of its divisors is an integer number (5212116).

Almost surely, 2^20827231 is an apocalyptic number.

20827231 is a deficient number, since it is larger than the sum of its proper divisors (21233).

20827231 is a wasteful number, since it uses less digits than its factorization.

20827231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21232.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20827231 is about 4563.6861197940. The cubic root of 20827231 is about 275.1337355034.

The spelling of 20827231 in words is "twenty million, eight hundred twenty-seven thousand, two hundred thirty-one".