20011223420440 has 32 divisors (see below), whose sum is σ = 51457431653280. Its totient is φ = 6860990886912.

The previous prime is 20011223420423. The next prime is 20011223420459. The reversal of 20011223420440 is 4402432211002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35734327257 + ... + 35734327816.

It is an arithmetic number, because the mean of its divisors is an integer number (1608044739165).

Almost surely, 2^{20011223420440} is an apocalyptic number.

20011223420440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011223420440 is an abundant number, since it is smaller than the sum of its proper divisors (31446208232840).

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

20011223420440 is a wasteful number, since it uses less digits than its factorization.

20011223420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71468655091 (or 71468655087 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 20011223420440 its reverse (4402432211002), we get a palindrome (24413655631442).

The spelling of 20011223420440 in words is "twenty trillion, eleven billion, two hundred twenty-three million, four hundred twenty thousand, four hundred forty".