20401344 has 42 divisors (see below), whose sum is σ = 58478420. Its totient is φ = 6800256.

The previous prime is 20401333. The next prime is 20401349. The reversal of 20401344 is 44310402.

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 (20401349) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 17134 + ... + 18285.

Almost surely, 2^20401344 is an apocalyptic number.

20401344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20401344 is an abundant number, since it is smaller than the sum of its proper divisors (38077076).

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

20401344 is a wasteful number, since it uses less digits than its factorization.

20401344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35437 (or 35424 counting only the distinct ones).

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

The square root of 20401344 is about 4516.7846971048. The cubic root of 20401344 is about 273.2454420301.

Adding to 20401344 its reverse (44310402), we get a palindrome (64711746).

The spelling of 20401344 in words is "twenty million, four hundred one thousand, three hundred forty-four".