20001201000020 has 48 divisors (see below), whose sum is σ = 43351958220480. Its totient is φ = 7747492752384.

The previous prime is 20001200999951. The next prime is 20001201000023. The reversal of 20001201000020 is 2000010210002.

It is a junction number, because it is equal to n+sod(n) for n = 20001200999971 and 20001201000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001201000023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126414749 + ... + 126572868.

It is an arithmetic number, because the mean of its divisors is an integer number (903165796260).

Almost surely, 2^{20001201000020} is an apocalyptic number.

20001201000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001201000020 is an abundant number, since it is smaller than the sum of its proper divisors (23350757220460).

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

20001201000020 is a wasteful number, since it uses less digits than its factorization.

20001201000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252987752 (or 252987750 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 20001201000020 its reverse (2000010210002), we get a palindrome (22001211210022).

The spelling of 20001201000020 in words is "twenty trillion, one billion, two hundred one million, twenty", and thus it is an aban number.