20011221223320 has 64 divisors (see below), whose sum is σ = 60047681944320. Its totient is φ = 5335079590784.

The previous prime is 20011221223319. The next prime is 20011221223351. The reversal of 20011221223320 is 2332212211002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18953724 + ... + 19981643.

It is an arithmetic number, because the mean of its divisors is an integer number (938245030380).

Almost surely, 2^{20011221223320} is an apocalyptic number.

20011221223320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011221223320 is an abundant number, since it is smaller than the sum of its proper divisors (40036460721000).

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

20011221223320 is a wasteful number, since it uses less digits than its factorization.

20011221223320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38939664 (or 38939660 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20011221223320 its reverse (2332212211002), we get a palindrome (22343433434322).

The spelling of 20011221223320 in words is "twenty trillion, eleven billion, two hundred twenty-one million, two hundred twenty-three thousand, three hundred twenty".