20440440220225 has 12 divisors (see below), whose sum is σ = 25346201995324. Its totient is φ = 16352315968320.

The previous prime is 20440440220169. The next prime is 20440440220229. The reversal of 20440440220225 is 52202204404402.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 689668794369 + 19750771425856 = 830463^2 + 4444184^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20440440220225 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440440220229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21106327 + ... + 22053523.

Almost surely, 2^{20440440220225} is an apocalyptic number.

20440440220225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20440440220225 is a deficient number, since it is larger than the sum of its proper divisors (4905761775099).

20440440220225 is an equidigital number, since it uses as much as digits as its factorization.

20440440220225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810404 (or 1810399 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 31.

Adding to 20440440220225 its reverse (52202204404402), we get a palindrome (72642644624627).

The spelling of 20440440220225 in words is "twenty trillion, four hundred forty billion, four hundred forty million, two hundred twenty thousand, two hundred twenty-five".