20478427 has 4 divisors (see below), whose sum is σ = 21031936. Its totient is φ = 19924920.

The previous prime is 20478413. The next prime is 20478431. The reversal of 20478427 is 72487402.

20478427 is nontrivially palindromic in base 5.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20478427 - 2¹⁹ = 19954139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20478392 and 20478401.

It is not an unprimeable number, because it can be changed into a prime (20479427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276699 + ... + 276772.

It is an arithmetic number, because the mean of its divisors is an integer number (5257984).

Almost surely, 2^20478427 is an apocalyptic number.

20478427 is a deficient number, since it is larger than the sum of its proper divisors (553509).

20478427 is an equidigital number, since it uses as much as digits as its factorization.

20478427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553508.

The product of its (nonzero) digits is 25088, while the sum is 34.

The square root of 20478427 is about 4525.3096026681. The cubic root of 20478427 is about 273.5891466218.

The spelling of 20478427 in words is "twenty million, four hundred seventy-eight thousand, four hundred twenty-seven".