20672747 has 2 divisors, whose sum is σ = 20672748. Its totient is φ = 20672746.

The previous prime is 20672683. The next prime is 20672767. The reversal of 20672747 is 74727602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20672747 - 2⁶ = 20672683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20672767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336373 + 10336374.

It is an arithmetic number, because the mean of its divisors is an integer number (10336374).

Almost surely, 2^20672747 is an apocalyptic number.

20672747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20672747 is an equidigital number, since it uses as much as digits as its factorization.

20672747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32928, while the sum is 35.

The square root of 20672747 is about 4546.7292639875. The cubic root of 20672747 is about 274.4517872022.

The spelling of 20672747 in words is "twenty million, six hundred seventy-two thousand, seven hundred forty-seven".