20256867 has 6 divisors (see below), whose sum is σ = 29259932. Its totient is φ = 13504572.

The previous prime is 20256853. The next prime is 20256889. The reversal of 20256867 is 76865202.

It is not a de Polignac number, because 20256867 - 2⁴ = 20256851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20256967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1125373 + ... + 1125390.

Almost surely, 2^20256867 is an apocalyptic number.

20256867 is a deficient number, since it is larger than the sum of its proper divisors (9003065).

20256867 is a wasteful number, since it uses less digits than its factorization.

20256867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2250769 (or 2250766 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 20256867 is about 4500.7629353255. The cubic root of 20256867 is about 272.5988957319.

The spelling of 20256867 in words is "twenty million, two hundred fifty-six thousand, eight hundred sixty-seven".