20228371 has 4 divisors (see below), whose sum is σ = 20345472. Its totient is φ = 20111272.

The previous prime is 20228363. The next prime is 20228423. The reversal of 20228371 is 17382202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17382202 = 2 ⋅8691101.

It is a cyclic number.

It is not a de Polignac number, because 20228371 - 2³ = 20228363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20228311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58291 + ... + 58636.

It is an arithmetic number, because the mean of its divisors is an integer number (5086368).

Almost surely, 2^20228371 is an apocalyptic number.

20228371 is a deficient number, since it is larger than the sum of its proper divisors (117101).

20228371 is a wasteful number, since it uses less digits than its factorization.

20228371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117100.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20228371 is about 4497.5961357152. The cubic root of 20228371 is about 272.4710111406.

The spelling of 20228371 in words is "twenty million, two hundred twenty-eight thousand, three hundred seventy-one".