20344140 has 36 divisors (see below), whose sum is σ = 61711104. Its totient is φ = 5425056.

The previous prime is 20344123. The next prime is 20344141. The reversal of 20344140 is 4144302.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (20344141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56332 + ... + 56691.

Almost surely, 2^20344140 is an apocalyptic number.

20344140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20344140 is an abundant number, since it is smaller than the sum of its proper divisors (41366964).

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

20344140 is a wasteful number, since it uses less digits than its factorization.

20344140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113038 (or 113033 counting only the distinct ones).

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

The square root of 20344140 is about 4510.4478713316. The cubic root of 20344140 is about 272.9898156648.

Adding to 20344140 its reverse (4144302), we get a palindrome (24488442).

The spelling of 20344140 in words is "twenty million, three hundred forty-four thousand, one hundred forty".