20440030 has 16 divisors (see below), whose sum is σ = 39622464. Its totient is φ = 7547040.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440030 is 3004402.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78486 + ... + 78745.

It is an arithmetic number, because the mean of its divisors is an integer number (2476404).

Almost surely, 2^20440030 is an apocalyptic number.

20440030 is a deficient number, since it is larger than the sum of its proper divisors (19182434).

20440030 is a wasteful number, since it uses less digits than its factorization.

20440030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157251.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20440030 is about 4521.0651399864. The cubic root of 20440030 is about 273.4180466487.

Adding to 20440030 its reverse (3004402), we get a palindrome (23444432).

The spelling of 20440030 in words is "twenty million, four hundred forty thousand, thirty".