20672237 has 2 divisors, whose sum is σ = 20672238. Its totient is φ = 20672236.

The previous prime is 20672231. The next prime is 20672261. The reversal of 20672237 is 73227602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16152361 + 4519876 = 4019^2 + 2126^2 .

It is a cyclic number.

It is not a de Polignac number, because 20672237 - 2¹⁰ = 20671213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20672231) 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, 10336118 + 10336119.

It is an arithmetic number, because the mean of its divisors is an integer number (10336119).

Almost surely, 2^20672237 is an apocalyptic number.

It is an amenable number.

20672237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20672237 is an equidigital number, since it uses as much as digits as its factorization.

20672237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 20672237 is about 4546.6731793697. The cubic root of 20672237 is about 274.4495302604.

Adding to 20672237 its reverse (73227602), we get a palindrome (93899839).

The spelling of 20672237 in words is "twenty million, six hundred seventy-two thousand, two hundred thirty-seven".