20672231 has 2 divisors, whose sum is σ = 20672232. Its totient is φ = 20672230.

The previous prime is 20672227. The next prime is 20672237. The reversal of 20672231 is 13227602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20672231 - 2² = 20672227 is a prime.

It is a super-2 number, since 2×20672231² = 854682269034722, which contains 22 as substring.

It is equal to p_1310477 and since 20672231 and 1310477 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20672197 and 20672206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20672237) 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 as a sum of consecutive naturals, namely, 10336115 + 10336116.

It is an arithmetic number, because the mean of its divisors is an integer number (10336116).

Almost surely, 2^20672231 is an apocalyptic number.

20672231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20672231 is an equidigital number, since it uses as much as digits as its factorization.

20672231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20672231 is about 4546.6725195466. The cubic root of 20672231 is about 274.4495037079.

Adding to 20672231 its reverse (13227602), we get a palindrome (33899833).

The spelling of 20672231 in words is "twenty million, six hundred seventy-two thousand, two hundred thirty-one".