20946487 has 2 divisors, whose sum is σ = 20946488. Its totient is φ = 20946486.

The previous prime is 20946481. The next prime is 20946503. The reversal of 20946487 is 78464902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20946487 - 2³ = 20946479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20946481) 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, 10473243 + 10473244.

It is an arithmetic number, because the mean of its divisors is an integer number (10473244).

Almost surely, 2^20946487 is an apocalyptic number.

20946487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20946487 is an equidigital number, since it uses as much as digits as its factorization.

20946487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 20946487 is about 4576.7332235996. The cubic root of 20946487 is about 275.6578717760.

The spelling of 20946487 in words is "twenty million, nine hundred forty-six thousand, four hundred eighty-seven".