20409884 has 12 divisors (see below), whose sum is σ = 38964408. Its totient is φ = 9277200.

The previous prime is 20409859. The next prime is 20409913. The reversal of 20409884 is 48890402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231887 + ... + 231974.

It is an arithmetic number, because the mean of its divisors is an integer number (3247034).

Almost surely, 2^20409884 is an apocalyptic number.

It is an amenable number.

20409884 is a deficient number, since it is larger than the sum of its proper divisors (18554524).

20409884 is a wasteful number, since it uses less digits than its factorization.

20409884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463876 (or 463874 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20409884 is about 4517.7299609428. The cubic root of 20409884 is about 273.2835635471.

It can be divided in two parts, 20 and 409884, that added together give a palindrome (409904).

The spelling of 20409884 in words is "twenty million, four hundred nine thousand, eight hundred eighty-four".