20441340 has 144 divisors (see below), whose sum is σ = 67267200. Its totient is φ = 5007744.

The previous prime is 20441269. The next prime is 20441347. The reversal of 20441340 is 4314402.

20441340 = T₃₉₉ + T₄₀₀ + ... + T₅₇₀.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20441347) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 146991 + ... + 147129.

Almost surely, 2^20441340 is an apocalyptic number.

20441340 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 20441340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33633600).

20441340 is an abundant number, since it is smaller than the sum of its proper divisors (46825860).

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

20441340 is a wasteful number, since it uses less digits than its factorization.

20441340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 211 counting only the distinct ones).

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

The square root of 20441340 is about 4521.2100150292. The cubic root of 20441340 is about 273.4238876380.

Adding to 20441340 its reverse (4314402), we get a palindrome (24755742).

The spelling of 20441340 in words is "twenty million, four hundred forty-one thousand, three hundred forty".