20260440 has 96 divisors (see below), whose sum is σ = 66437280. Its totient is φ = 5354496.

The previous prime is 20260433. The next prime is 20260451. The reversal of 20260440 is 4406202.

20260440 is a `hidden beast` number, since 20 + 2 + 604 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 59952 + ... + 60288.

It is an arithmetic number, because the mean of its divisors is an integer number (692055).

Almost surely, 2^20260440 is an apocalyptic number.

20260440 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 20260440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33218640).

20260440 is an abundant number, since it is smaller than the sum of its proper divisors (46176840).

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

20260440 is a wasteful number, since it uses less digits than its factorization.

20260440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20260440 is about 4501.1598505274. The cubic root of 20260440 is about 272.6149222082.

Adding to 20260440 its reverse (4406202), we get a palindrome (24666642).

The spelling of 20260440 in words is "twenty million, two hundred sixty thousand, four hundred forty".