201220423020 has 192 divisors, whose sum is σ = 665368704000. Its totient is φ = 50340828672.

The previous prime is 201220423009. The next prime is 201220423069. The reversal of 201220423020 is 20324022102.

201220423020 is a `hidden beast` number, since 2 + 0 + 1 + 220 + 423 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 201220422984 and 201220423002.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 961576 + ... + 1151984.

It is an arithmetic number, because the mean of its divisors is an integer number (3465462000).

Almost surely, 2^201220423020 is an apocalyptic number.

201220423020 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 201220423020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332684352000).

201220423020 is an abundant number, since it is smaller than the sum of its proper divisors (464148280980).

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

201220423020 is a wasteful number, since it uses less digits than its factorization.

201220423020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190549 (or 190541 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 201220423020 its reverse (20324022102), we get a palindrome (221544445122).

The spelling of 201220423020 in words is "two hundred one billion, two hundred twenty million, four hundred twenty-three thousand, twenty".