20954867 has 2 divisors, whose sum is σ = 20954868. Its totient is φ = 20954866.

The previous prime is 20954861. The next prime is 20954881. The reversal of 20954867 is 76845902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20954867 - 2¹² = 20950771 is a prime.

It is not a weakly prime, because it can be changed into another prime (20954861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477433 + 10477434.

It is an arithmetic number, because the mean of its divisors is an integer number (10477434).

Almost surely, 2^20954867 is an apocalyptic number.

20954867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20954867 is an equidigital number, since it uses as much as digits as its factorization.

20954867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 20954867 is about 4577.6486322128. The cubic root of 20954867 is about 275.6946274219.

The spelling of 20954867 in words is "twenty million, nine hundred fifty-four thousand, eight hundred sixty-seven".