20672671 has 2 divisors, whose sum is σ = 20672672. Its totient is φ = 20672670.

The previous prime is 20672669. The next prime is 20672681. The reversal of 20672671 is 17627602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20672671 - 2¹ = 20672669 is a prime.

Together with 20672669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20672681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336335 + 10336336.

It is an arithmetic number, because the mean of its divisors is an integer number (10336336).

Almost surely, 2^20672671 is an apocalyptic number.

20672671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20672671 is an equidigital number, since it uses as much as digits as its factorization.

20672671 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 31.

The square root of 20672671 is about 4546.7209063236. The cubic root of 20672671 is about 274.4514508760.

The spelling of 20672671 in words is "twenty million, six hundred seventy-two thousand, six hundred seventy-one".