20105427 has 16 divisors (see below), whose sum is σ = 28396800. Its totient is φ = 12626592.

The previous prime is 20105419. The next prime is 20105443. The reversal of 20105427 is 72450102.

It is not a de Polignac number, because 20105427 - 2³ = 20105419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20105447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2449 + ... + 6797.

It is an arithmetic number, because the mean of its divisors is an integer number (1774800).

Almost surely, 2^20105427 is an apocalyptic number.

20105427 is a deficient number, since it is larger than the sum of its proper divisors (8291373).

20105427 is a wasteful number, since it uses less digits than its factorization.

20105427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20105427 is about 4483.9075592612. The cubic root of 20105427 is about 271.9178808833.

Adding to 20105427 its reverse (72450102), we get a palindrome (92555529).

The spelling of 20105427 in words is "twenty million, one hundred five thousand, four hundred twenty-seven".