20427231 has 8 divisors (see below), whose sum is σ = 29712384. Its totient is φ = 12380120.

The previous prime is 20427229. The next prime is 20427241. The reversal of 20427231 is 13272402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20427231 - 2¹ = 20427229 is a prime.

It is a super-2 number, since 2×20427231² = 834543532654722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20427198 and 20427207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309471 + ... + 309536.

It is an arithmetic number, because the mean of its divisors is an integer number (3714048).

Almost surely, 2^20427231 is an apocalyptic number.

20427231 is a deficient number, since it is larger than the sum of its proper divisors (9285153).

20427231 is a wasteful number, since it uses less digits than its factorization.

20427231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619021.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20427231 is about 4519.6494333079. The cubic root of 20427231 is about 273.3609657106.

Adding to 20427231 its reverse (13272402), we get a palindrome (33699633).

The spelling of 20427231 in words is "twenty million, four hundred twenty-seven thousand, two hundred thirty-one".