20440245 has 32 divisors (see below), whose sum is σ = 38092032. Its totient is φ = 9165312.

The previous prime is 20440213. The next prime is 20440249. The reversal of 20440245 is 54204402.

It is not a de Polignac number, because 20440245 - 2⁵ = 20440213 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3729 + ... + 7401.

It is an arithmetic number, because the mean of its divisors is an integer number (1190376).

Almost surely, 2^20440245 is an apocalyptic number.

It is an amenable number.

20440245 is a deficient number, since it is larger than the sum of its proper divisors (17651787).

20440245 is a wasteful number, since it uses less digits than its factorization.

20440245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741.

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20440245 is about 4521.0889175065. The cubic root of 20440245 is about 273.4190053015.

Adding to 20440245 its reverse (54204402), we get a palindrome (74644647).

The spelling of 20440245 in words is "twenty million, four hundred forty thousand, two hundred forty-five".