20228511 has 8 divisors (see below), whose sum is σ = 27296640. Its totient is φ = 13323032.

The previous prime is 20228501. The next prime is 20228561. The reversal of 20228511 is 11582202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20228511 - 2¹⁷ = 20097439 is a prime.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 40371 + ... + 40868.

It is an arithmetic number, because the mean of its divisors is an integer number (3412080).

Almost surely, 2^20228511 is an apocalyptic number.

20228511 is a deficient number, since it is larger than the sum of its proper divisors (7068129).

20228511 is an equidigital number, since it uses as much as digits as its factorization.

20228511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81325.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20228511 is about 4497.6116995579. The cubic root of 20228511 is about 272.4716397273.

The spelling of 20228511 in words is "twenty million, two hundred twenty-eight thousand, five hundred eleven".