20001001022120 has 32 divisors (see below), whose sum is σ = 45002542307400. Its totient is φ = 8000348851968.

The previous prime is 20001001022081. The next prime is 20001001022153. The reversal of 20001001022120 is 2122010010002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17574054548164 + 2426946473956 = 4192142^2 + 1557866^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5009342 + ... + 8068178.

Almost surely, 2^{20001001022120} is an apocalyptic number.

20001001022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001001022120 is an abundant number, since it is smaller than the sum of its proper divisors (25001541285280).

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

20001001022120 is a wasteful number, since it uses less digits than its factorization.

20001001022120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222317 (or 3222313 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20001001022120 its reverse (2122010010002), we get a palindrome (22123011032122).

The spelling of 20001001022120 in words is "twenty trillion, one billion, one million, twenty-two thousand, one hundred twenty".