20428205 has 16 divisors (see below), whose sum is σ = 28089984. Its totient is φ = 13970880.

The previous prime is 20428201. The next prime is 20428217. The reversal of 20428205 is 50282402.

It is not a de Polignac number, because 20428205 - 2² = 20428201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20428201) 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, 22694 + ... + 23576.

It is an arithmetic number, because the mean of its divisors is an integer number (1755624).

Almost surely, 2^20428205 is an apocalyptic number.

It is an amenable number.

20428205 is a deficient number, since it is larger than the sum of its proper divisors (7661779).

20428205 is an equidigital number, since it uses as much as digits as its factorization.

20428205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20428205 is about 4519.7571837434. The cubic root of 20428205 is about 273.3653103907.

The spelling of 20428205 in words is "twenty million, four hundred twenty-eight thousand, two hundred five".