20440684 has 12 divisors (see below), whose sum is σ = 39023208. Its totient is φ = 9291200.

The previous prime is 20440649. The next prime is 20440691. The reversal of 20440684 is 48604402.

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, 232237 + ... + 232324.

It is an arithmetic number, because the mean of its divisors is an integer number (3251934).

Almost surely, 2^20440684 is an apocalyptic number.

It is an amenable number.

20440684 is a deficient number, since it is larger than the sum of its proper divisors (18582524).

20440684 is a wasteful number, since it uses less digits than its factorization.

20440684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464576 (or 464574 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 20440684 is about 4521.1374674964. The cubic root of 20440684 is about 273.4209627158.

The spelling of 20440684 in words is "twenty million, four hundred forty thousand, six hundred eighty-four".