20464867 has 4 divisors (see below), whose sum is σ = 21125056. Its totient is φ = 19804680.

The previous prime is 20464849. The next prime is 20464883. The reversal of 20464867 is 76846402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76846402 = 2 ⋅38423201.

It is a cyclic number.

It is not a de Polignac number, because 20464867 - 2¹⁵ = 20432099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20464817) 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 3 ways as a sum of consecutive naturals, for example, 330048 + ... + 330109.

It is an arithmetic number, because the mean of its divisors is an integer number (5281264).

Almost surely, 2^20464867 is an apocalyptic number.

20464867 is a deficient number, since it is larger than the sum of its proper divisors (660189).

20464867 is an equidigital number, since it uses as much as digits as its factorization.

20464867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660188.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 20464867 is about 4523.8111145361. The cubic root of 20464867 is about 273.5287466707.

The spelling of 20464867 in words is "twenty million, four hundred sixty-four thousand, eight hundred sixty-seven".