20678419 has 4 divisors (see below), whose sum is σ = 20701840. Its totient is φ = 20655000.

The previous prime is 20678417. The next prime is 20678423. The reversal of 20678419 is 91487602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91487602 = 2 ⋅45743801.

It is a cyclic number.

It is not a de Polignac number, because 20678419 - 2¹ = 20678417 is a prime.

It is a super-2 number, since 2×20678419² = 855194024679122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20678417) 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, 10332 + ... + 12169.

It is an arithmetic number, because the mean of its divisors is an integer number (5175460).

Almost surely, 2^20678419 is an apocalyptic number.

20678419 is a deficient number, since it is larger than the sum of its proper divisors (23421).

20678419 is an equidigital number, since it uses as much as digits as its factorization.

20678419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23420.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20678419 is about 4547.3529662871. The cubic root of 20678419 is about 274.4768854340.

The spelling of 20678419 in words is "twenty million, six hundred seventy-eight thousand, four hundred nineteen".