20200121000020 has 96 divisors (see below), whose sum is σ = 46157458828320. Its totient is φ = 7381170585600.

The previous prime is 20200121000011. The next prime is 20200121000083. The reversal of 20200121000020 is 2000012100202.

It can be written as a sum of positive squares in 16 ways, for example, as 5088895316164 + 15111225683856 = 2255858^2 + 3887316^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20200120999970 and 20200121000006.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 55726884 + ... + 56088196.

It is an arithmetic number, because the mean of its divisors is an integer number (480806862795).

Almost surely, 2^{20200121000020} is an apocalyptic number.

20200121000020 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 20200121000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23078729414160).

20200121000020 is an abundant number, since it is smaller than the sum of its proper divisors (25957337828300).

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

20200121000020 is a wasteful number, since it uses less digits than its factorization.

20200121000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363565 (or 363563 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20200121000020 its reverse (2000012100202), we get a palindrome (22200133100222).

The spelling of 20200121000020 in words is "twenty trillion, two hundred billion, one hundred twenty-one million, twenty", and thus it is an aban number.