20440224440 has 16 divisors (see below), whose sum is σ = 45990505080. Its totient is φ = 8176089760.

The previous prime is 20440224437. The next prime is 20440224461. The reversal of 20440224440 is 4442204402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255502766 + ... + 255502845.

Almost surely, 2^20440224440 is an apocalyptic number.

20440224440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440224440 is an abundant number, since it is smaller than the sum of its proper divisors (25550280640).

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

20440224440 is a wasteful number, since it uses less digits than its factorization.

20440224440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511005622 (or 511005618 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 20440224440 its reverse (4442204402), we get a palindrome (24882428842).

The spelling of 20440224440 in words is "twenty billion, four hundred forty million, two hundred twenty-four thousand, four hundred forty".