20113440 has 48 divisors (see below), whose sum is σ = 63358848. Its totient is φ = 5363456.

The previous prime is 20113433. The next prime is 20113453. The reversal of 20113440 is 4431102.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20472 + ... + 21431.

It is an arithmetic number, because the mean of its divisors is an integer number (1319976).

Almost surely, 2^20113440 is an apocalyptic number.

20113440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20113440 is an abundant number, since it is smaller than the sum of its proper divisors (43245408).

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

20113440 is a wasteful number, since it uses less digits than its factorization.

20113440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41921 (or 41913 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20113440 is about 4484.8009989296. The cubic root of 20113440 is about 271.9540002949.

Adding to 20113440 its reverse (4431102), we get a palindrome (24544542).

The spelling of 20113440 in words is "twenty million, one hundred thirteen thousand, four hundred forty".