20672123 has 2 divisors, whose sum is σ = 20672124. Its totient is φ = 20672122.

The previous prime is 20672083. The next prime is 20672131. The reversal of 20672123 is 32127602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20672123 - 2¹² = 20668027 is a prime.

It is not a weakly prime, because it can be changed into another prime (20672023) 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, 10336061 + 10336062.

It is an arithmetic number, because the mean of its divisors is an integer number (10336062).

Almost surely, 2^20672123 is an apocalyptic number.

20672123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20672123 is an equidigital number, since it uses as much as digits as its factorization.

20672123 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 20672123 is about 4546.6606427135. The cubic root of 20672123 is about 274.4490257625.

Adding to 20672123 its reverse (32127602), we get a palindrome (52799725).

The spelling of 20672123 in words is "twenty million, six hundred seventy-two thousand, one hundred twenty-three".