20440371 has 16 divisors (see below), whose sum is σ = 32787200. Its totient is φ = 11065248.

The previous prime is 20440369. The next prime is 20440379. The reversal of 20440371 is 17304402.

It is not a de Polignac number, because 20440371 - 2¹ = 20440369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25216 + ... + 26013.

It is an arithmetic number, because the mean of its divisors is an integer number (2049200).

Almost surely, 2^20440371 is an apocalyptic number.

20440371 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20440371 is a deficient number, since it is larger than the sum of its proper divisors (12346829).

20440371 is a wasteful number, since it uses less digits than its factorization.

20440371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51258.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20440371 is about 4521.1028521811. The cubic root of 20440371 is about 273.4195671135.

Adding to 20440371 its reverse (17304402), we get a palindrome (37744773).

It can be divided in two parts, 20 and 440371, that added together give a triangular number (440391 = T₉₃₈).

The spelling of 20440371 in words is "twenty million, four hundred forty thousand, three hundred seventy-one".