20440002 has 32 divisors (see below), whose sum is σ = 45336384. Its totient is φ = 6091200.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440002 is 20004402.

It is a self number, because there is not a number n which added to its sum of digits gives 20440002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1488 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (1416762).

Almost surely, 2^20440002 is an apocalyptic number.

20440002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20440002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22668192).

20440002 is an abundant number, since it is smaller than the sum of its proper divisors (24896382).

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

20440002 is a wasteful number, since it uses less digits than its factorization.

20440002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5154.

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20440002 is about 4521.0620433699. The cubic root of 20440002 is about 273.4179218004.

Adding to 20440002 its reverse (20004402), we get a palindrome (40444404).

Subtracting from 20440002 its reverse (20004402), we obtain a square (435600 = 660²).

The spelling of 20440002 in words is "twenty million, four hundred forty thousand, two".