20228385 has 32 divisors (see below), whose sum is σ = 35769600. Its totient is φ = 9709568.

The previous prime is 20228363. The next prime is 20228423. The reversal of 20228385 is 58382202.

It is a cyclic number.

It is not a de Polignac number, because 20228385 - 2⁶ = 20228321 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4141 + ... + 7589.

It is an arithmetic number, because the mean of its divisors is an integer number (1117800).

Almost surely, 2^20228385 is an apocalyptic number.

It is an amenable number.

20228385 is a deficient number, since it is larger than the sum of its proper divisors (15541215).

20228385 is a wasteful number, since it uses less digits than its factorization.

20228385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3497.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20228385 is about 4497.5976921019. The cubic root of 20228385 is about 272.4710739994.

The spelling of 20228385 in words is "twenty million, two hundred twenty-eight thousand, three hundred eighty-five".