20101201000020 has 144 divisors (see below), whose sum is σ = 71166805452288. Its totient is φ = 4496803614720.

The previous prime is 20101200999977. The next prime is 20101201000039. The reversal of 20101201000020 is 2000010210102.

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

It is a junction number, because it is equal to n+sod(n) for n = 20101200999966 and 20101201000011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 169657101 + ... + 169775540.

It is an arithmetic number, because the mean of its divisors is an integer number (494213926752).

Almost surely, 2^{20101201000020} is an apocalyptic number.

20101201000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20101201000020 is an abundant number, since it is smaller than the sum of its proper divisors (51065604452268).

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

20101201000020 is a wasteful number, since it uses less digits than its factorization.

20101201000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339432710 (or 339432705 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20101201000020 its reverse (2000010210102), we get a palindrome (22101211210122).

The spelling of 20101201000020 in words is "twenty trillion, one hundred one billion, two hundred one million, twenty", and thus it is an aban number.