20111203211220 has 144 divisors (see below), whose sum is σ = 66842972134848. Its totient is φ = 4853965370880.

The previous prime is 20111203211179. The next prime is 20111203211263. The reversal of 20111203211220 is 2211230211102.

20111203211220 is a `hidden beast` number, since 2 + 0 + 1 + 1 + 120 + 321 + 1 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20111203211193 and 20111203211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21923169 + ... + 22822088.

It is an arithmetic number, because the mean of its divisors is an integer number (464187306492).

Almost surely, 2^{20111203211220} is an apocalyptic number.

20111203211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111203211220 is an abundant number, since it is smaller than the sum of its proper divisors (46731768923628).

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

20111203211220 is a wasteful number, since it uses less digits than its factorization.

20111203211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44745510 (or 44745505 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20111203211220 its reverse (2211230211102), we get a palindrome (22322433422322).

The spelling of 20111203211220 in words is "twenty trillion, one hundred eleven billion, two hundred three million, two hundred eleven thousand, two hundred twenty".