20401144 has 16 divisors (see below), whose sum is σ = 38367000. Its totient is φ = 10169952.

The previous prime is 20401141. The next prime is 20401217. The reversal of 20401144 is 44110402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862 + ... + 6445.

Almost surely, 2^20401144 is an apocalyptic number.

It is an amenable number.

20401144 is a deficient number, since it is larger than the sum of its proper divisors (17965856).

20401144 is a wasteful number, since it uses less digits than its factorization.

20401144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7662 (or 7658 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20401144 is about 4516.7625574077. The cubic root of 20401144 is about 273.2445491271.

Adding to 20401144 its reverse (44110402), we get a palindrome (64511546).

The spelling of 20401144 in words is "twenty million, four hundred one thousand, one hundred forty-four".