20427967 has 8 divisors (see below), whose sum is σ = 23889536. Its totient is φ = 17102232.

The previous prime is 20427943. The next prime is 20427971. The reversal of 20427967 is 76972402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20427967 - 2¹⁹ = 19903679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20427917) 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 in 7 ways as a sum of consecutive naturals, for example, 33633 + ... + 34234.

It is an arithmetic number, because the mean of its divisors is an integer number (2986192).

Almost surely, 2^20427967 is an apocalyptic number.

20427967 is a deficient number, since it is larger than the sum of its proper divisors (3461569).

20427967 is an equidigital number, since it uses as much as digits as its factorization.

20427967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67917.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 20427967 is about 4519.7308548187. The cubic root of 20427967 is about 273.3642487670.

The spelling of 20427967 in words is "twenty million, four hundred twenty-seven thousand, nine hundred sixty-seven".