20321223333440 has 112 divisors (see below), whose sum is σ = 50879273765760. Its totient is φ = 7715724656640.

The previous prime is 20321223333427. The next prime is 20321223333443. The reversal of 20321223333440 is 4433332212302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 20321223333397 and 20321223333406.

It is not an unprimeable number, because it can be changed into a prime (20321223333443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9574145 + ... + 11502464.

Almost surely, 2^{20321223333440} is an apocalyptic number.

20321223333440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321223333440 is an abundant number, since it is smaller than the sum of its proper divisors (30558050432320).

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

20321223333440 is a wasteful number, since it uses less digits than its factorization.

20321223333440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21076780 (or 21076770 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 32.

Adding to 20321223333440 its reverse (4433332212302), we get a palindrome (24754555545742).

The spelling of 20321223333440 in words is "twenty trillion, three hundred twenty-one billion, two hundred twenty-three million, three hundred thirty-three thousand, four hundred forty".