20807427 has 4 divisors (see below), whose sum is σ = 27743240. Its totient is φ = 13871616.

The previous prime is 20807407. The next prime is 20807443. The reversal of 20807427 is 72470802.

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

It is not a de Polignac number, because 20807427 - 2⁶ = 20807363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20807394 and 20807403.

It is not an unprimeable number, because it can be changed into a prime (20807407) 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, 3467902 + ... + 3467907.

It is an arithmetic number, because the mean of its divisors is an integer number (6935810).

Almost surely, 2^20807427 is an apocalyptic number.

20807427 is a deficient number, since it is larger than the sum of its proper divisors (6935813).

20807427 is an equidigital number, since it uses as much as digits as its factorization.

20807427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6935812.

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20807427 is about 4561.5158664637. The cubic root of 20807427 is about 275.0465023289.

The spelling of 20807427 in words is "twenty million, eight hundred seven thousand, four hundred twenty-seven".