20228805 has 32 divisors (see below), whose sum is σ = 37209600. Its totient is φ = 10414656.

The previous prime is 20228801. The next prime is 20228807. The reversal of 20228805 is 50882202.

It is not a de Polignac number, because 20228805 - 2² = 20228801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20228801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1332 + ... + 6498.

It is an arithmetic number, because the mean of its divisors is an integer number (1162800).

Almost surely, 2^20228805 is an apocalyptic number.

It is an amenable number.

20228805 is a deficient number, since it is larger than the sum of its proper divisors (16980795).

20228805 is a wasteful number, since it uses less digits than its factorization.

20228805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5210 (or 5204 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 20228805 is about 4497.6443834523. The cubic root of 20228805 is about 272.4729597499.

The spelling of 20228805 in words is "twenty million, two hundred twenty-eight thousand, eight hundred five".