20201200999956 has 96 divisors (see below), whose sum is σ = 53594253820800. Its totient is φ = 6576793816320.

The previous prime is 20201200999943. The next prime is 20201200999957. The reversal of 20201200999956 is 65999900210202.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201200999957) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98670976 + ... + 98875496.

It is an arithmetic number, because the mean of its divisors is an integer number (558273477300).

Almost surely, 2^{20201200999956} is an apocalyptic number.

It is an amenable number.

20201200999956 is an abundant number, since it is smaller than the sum of its proper divisors (33393052820844).

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

20201200999956 is a wasteful number, since it uses less digits than its factorization.

20201200999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225846 (or 225838 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The spelling of 20201200999956 in words is "twenty trillion, two hundred one billion, two hundred million, nine hundred ninety-nine thousand, nine hundred fifty-six".