20766451 has 2 divisors, whose sum is σ = 20766452. Its totient is φ = 20766450.

The previous prime is 20766443. The next prime is 20766467. The reversal of 20766451 is 15466702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20766451 - 2³ = 20766443 is a prime.

It is not a weakly prime, because it can be changed into another prime (20766751) 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, 10383225 + 10383226.

It is an arithmetic number, because the mean of its divisors is an integer number (10383226).

Almost surely, 2^20766451 is an apocalyptic number.

20766451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20766451 is an equidigital number, since it uses as much as digits as its factorization.

20766451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20766451 is about 4557.0221636503. The cubic root of 20766451 is about 274.8658342790.

The spelling of 20766451 in words is "twenty million, seven hundred sixty-six thousand, four hundred fifty-one".