20470440 has 64 divisors (see below), whose sum is σ = 61819200. Its totient is φ = 5422592.

The previous prime is 20470421. The next prime is 20470459. The reversal of 20470440 is 4407402.

It is an interprime number because it is at equal distance from previous prime (20470421) and next prime (20470459).

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 15 ways as a sum of consecutive naturals, for example, 21004 + ... + 21956.

It is an arithmetic number, because the mean of its divisors is an integer number (965925).

Almost surely, 2^20470440 is an apocalyptic number.

20470440 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 20470440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30909600).

20470440 is an abundant number, since it is smaller than the sum of its proper divisors (41348760).

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

20470440 is a wasteful number, since it uses less digits than its factorization.

20470440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146 (or 1142 counting only the distinct ones).

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

The square root of 20470440 is about 4524.4270355483. The cubic root of 20470440 is about 273.5535735663.

Adding to 20470440 its reverse (4407402), we get a palindrome (24877842).

It can be divided in two parts, 20470 and 440, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20470440 in words is "twenty million, four hundred seventy thousand, four hundred forty".