20967457 has 4 divisors (see below), whose sum is σ = 23962816. Its totient is φ = 17972100.

The previous prime is 20967451. The next prime is 20967473. The reversal of 20967457 is 75476902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75476902 = 2 ⋅37738451.

It is a cyclic number.

It is not a de Polignac number, because 20967457 - 2¹¹ = 20965409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20967451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1497669 + ... + 1497682.

It is an arithmetic number, because the mean of its divisors is an integer number (5990704).

Almost surely, 2^20967457 is an apocalyptic number.

It is an amenable number.

20967457 is a deficient number, since it is larger than the sum of its proper divisors (2995359).

20967457 is an equidigital number, since it uses as much as digits as its factorization.

20967457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995358.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 20967457 is about 4579.0235858750. The cubic root of 20967457 is about 275.7498301973.

The spelling of 20967457 in words is "twenty million, nine hundred sixty-seven thousand, four hundred fifty-seven".