20420105 has 16 divisors (see below), whose sum is σ = 25147584. Its totient is φ = 15912000.

The previous prime is 20420083. The next prime is 20420107. The reversal of 20420105 is 50102402.

It is not a de Polignac number, because 20420105 - 2⁸ = 20419849 is a prime.

It is a super-2 number, since 2×20420105² = 833961376422050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20420105.

It is not an unprimeable number, because it can be changed into a prime (20420107) 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, 66362 + ... + 66668.

It is an arithmetic number, because the mean of its divisors is an integer number (1571724).

Almost surely, 2^20420105 is an apocalyptic number.

It is an amenable number.

20420105 is a deficient number, since it is larger than the sum of its proper divisors (4727479).

20420105 is a wasteful number, since it uses less digits than its factorization.

20420105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20420105 is about 4518.8610290647. The cubic root of 20420105 is about 273.3291748657.

Adding to 20420105 its reverse (50102402), we get a palindrome (70522507).

The spelling of 20420105 in words is "twenty million, four hundred twenty thousand, one hundred five".