20408704 has 64 divisors (see below), whose sum is σ = 43953840. Its totient is φ = 9404416.

The previous prime is 20408701. The next prime is 20408711. The reversal of 20408704 is 40780402.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408701) 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 7 ways as a sum of consecutive naturals, for example, 180552 + ... + 180664.

Almost surely, 2^20408704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20408704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21976920).

20408704 is an abundant number, since it is smaller than the sum of its proper divisors (23545136).

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

20408704 is a wasteful number, since it uses less digits than its factorization.

20408704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 20408704 is about 4517.5993624933. The cubic root of 20408704 is about 273.2782968045.

It can be divided in two parts, 20408 and 704, that added together give a palindrome (21112).

The spelling of 20408704 in words is "twenty million, four hundred eight thousand, seven hundred four".