20341440 has 168 divisors, whose sum is σ = 80040480. Its totient is φ = 4644864.

The previous prime is 20341439. The next prime is 20341481. The reversal of 20341440 is 4414302.

It is a tau number, because it is divible by the number of its divisors (168).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19656 + ... + 20664.

Almost surely, 2^20341440 is an apocalyptic number.

20341440 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 20341440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40020240).

20341440 is an abundant number, since it is smaller than the sum of its proper divisors (59699040).

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

20341440 is a wasteful number, since it uses less digits than its factorization.

20341440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1026 counting only the distinct ones).

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

The square root of 20341440 is about 4510.1485563116. The cubic root of 20341440 is about 272.9777383933.

Adding to 20341440 its reverse (4414302), we get a palindrome (24755742).

The spelling of 20341440 in words is "twenty million, three hundred forty-one thousand, four hundred forty".