20122221223220 has 24 divisors (see below), whose sum is σ = 42256888738344. Its totient is φ = 8048845790336.

The previous prime is 20122221223217. The next prime is 20122221223301. The reversal of 20122221223220 is 2232212222102.

It can be written as a sum of positive squares in 4 ways, for example, as 3731010724 + 20118490212496 = 61082^2 + 4485364^2 .

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, 1342694 + ... + 6484386.

It is an arithmetic number, because the mean of its divisors is an integer number (1760703697431).

Almost surely, 2^{20122221223220} is an apocalyptic number.

20122221223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20122221223220 is an abundant number, since it is smaller than the sum of its proper divisors (22134667515124).

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

20122221223220 is a wasteful number, since it uses less digits than its factorization.

20122221223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337379 (or 5337377 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20122221223220 its reverse (2232212222102), we get a palindrome (22354433445322).

The spelling of 20122221223220 in words is "twenty trillion, one hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-three thousand, two hundred twenty".