20228505 has 16 divisors (see below), whose sum is σ = 35308224. Its totient is φ = 9807680.

The previous prime is 20228501. The next prime is 20228561. The reversal of 20228505 is 50582202.

It is not a de Polignac number, because 20228505 - 2² = 20228501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20228501) 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, 61134 + ... + 61463.

It is an arithmetic number, because the mean of its divisors is an integer number (2206764).

Almost surely, 2^20228505 is an apocalyptic number.

It is an amenable number.

20228505 is a deficient number, since it is larger than the sum of its proper divisors (15079719).

20228505 is a wasteful number, since it uses less digits than its factorization.

20228505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122616.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 20228505 is about 4497.6110325372. The cubic root of 20228505 is about 272.4716127879.

The spelling of 20228505 in words is "twenty million, two hundred twenty-eight thousand, five hundred five".