20946817 has 2 divisors, whose sum is σ = 20946818. Its totient is φ = 20946816.

The previous prime is 20946803. The next prime is 20946833. The reversal of 20946817 is 71864902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18870336 + 2076481 = 4344^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 20946817 - 2⁷ = 20946689 is a prime.

It is not a weakly prime, because it can be changed into another prime (20946017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10473408 + 10473409.

It is an arithmetic number, because the mean of its divisors is an integer number (10473409).

Almost surely, 2^20946817 is an apocalyptic number.

It is an amenable number.

20946817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20946817 is an equidigital number, since it uses as much as digits as its factorization.

20946817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20946817 is about 4576.7692753732. The cubic root of 20946817 is about 275.6593193794.

It can be divided in two parts, 2094 and 6817, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 20946817 in words is "twenty million, nine hundred forty-six thousand, eight hundred seventeen".