20409288 has 16 divisors (see below), whose sum is σ = 51023280. Its totient is φ = 6803088.

The previous prime is 20409283. The next prime is 20409317. The reversal of 20409288 is 88290402.

It is not an unprimeable number, because it can be changed into a prime (20409283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425170 + ... + 425217.

It is an arithmetic number, because the mean of its divisors is an integer number (3188955).

Almost surely, 2^20409288 is an apocalyptic number.

It is an amenable number.

20409288 is an abundant number, since it is smaller than the sum of its proper divisors (30613992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20409288 is a wasteful number, since it uses less digits than its factorization.

20409288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850396 (or 850392 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20409288 is about 4517.6639981300. The cubic root of 20409288 is about 273.2809034211.

The spelling of 20409288 in words is "twenty million, four hundred nine thousand, two hundred eighty-eight".