20704440 has 64 divisors (see below), whose sum is σ = 63452160. Its totient is φ = 5402240.

The previous prime is 20704417. The next prime is 20704447. The reversal of 20704440 is 4440702.

20704440 = T₂₉ + T₃₀ + ... + T₄₉₈.

It is a super-3 number, since 3×20704440³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20704447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3805 + ... + 7475.

It is an arithmetic number, because the mean of its divisors is an integer number (991440).

Almost surely, 2^20704440 is an apocalyptic number.

20704440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20704440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31726080).

20704440 is an abundant number, since it is smaller than the sum of its proper divisors (42747720).

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

20704440 is a wasteful number, since it uses less digits than its factorization.

20704440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732 (or 3728 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 20704440 is about 4550.2131818191. The cubic root of 20704440 is about 274.5919678832.

The spelling of 20704440 in words is "twenty million, seven hundred four thousand, four hundred forty".