201220001020 has 12 divisors (see below), whose sum is σ = 422562002184. Its totient is φ = 80488000400.

The previous prime is 201220000981. The next prime is 201220001051. The reversal of 201220001020 is 20100022102.

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 = 201220000988 and 201220001006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5030500006 + ... + 5030500045.

It is an arithmetic number, because the mean of its divisors is an integer number (35213500182).

Almost surely, 2^201220001020 is an apocalyptic number.

201220001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201220001020 is an abundant number, since it is smaller than the sum of its proper divisors (221342001164).

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

201220001020 is a wasteful number, since it uses less digits than its factorization.

201220001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061000060 (or 10061000058 counting only the distinct ones).

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

Adding to 201220001020 its reverse (20100022102), we get a palindrome (221320023122).

The spelling of 201220001020 in words is "two hundred one billion, two hundred twenty million, one thousand, twenty".