20213255322440 has 64 divisors (see below), whose sum is σ = 45792276706800. Its totient is φ = 8029941792768.

The previous prime is 20213255322437. The next prime is 20213255322509. The reversal of 20213255322440 is 4422355231202.

It can be written as a sum of positive squares in 8 ways, for example, as 17720513261476 + 2492742060964 = 4209574^2 + 1578842^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20213255322440.

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, 547046 + ... + 6381674.

Almost surely, 2^{20213255322440} is an apocalyptic number.

20213255322440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20213255322440 is an abundant number, since it is smaller than the sum of its proper divisors (25579021384360).

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

20213255322440 is a wasteful number, since it uses less digits than its factorization.

20213255322440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5835234 (or 5835230 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

The spelling of 20213255322440 in words is "twenty trillion, two hundred thirteen billion, two hundred fifty-five million, three hundred twenty-two thousand, four hundred forty".