20001222000 has 320 divisors, whose sum is σ = 72096635520. Its totient is φ = 5300352000.

The previous prime is 20001221987. The next prime is 20001222013. The reversal of 20001222000 is 22210002.

It is an interprime number because it is at equal distance from previous prime (20001221987) and next prime (20001222013).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9340930 + ... + 9343070.

It is an arithmetic number, because the mean of its divisors is an integer number (225301986).

Almost surely, 2^20001222000 is an apocalyptic number.

20001222000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36048317760).

20001222000 is an abundant number, since it is smaller than the sum of its proper divisors (52095413520).

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

20001222000 is a wasteful number, since it uses less digits than its factorization.

20001222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346 (or 2324 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20001222000 its reverse (22210002), we get a palindrome (20023432002).

The spelling of 20001222000 in words is "twenty billion, one million, two hundred twenty-two thousand".