20132221020 has 96 divisors (see below), whose sum is σ = 59517454080. Its totient is φ = 5070574080.

The previous prime is 20132221019. The next prime is 20132221033. The reversal of 20132221020 is 2012223102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 350664 + ... + 404016.

It is an arithmetic number, because the mean of its divisors is an integer number (619973480).

Almost surely, 2^20132221020 is an apocalyptic number.

20132221020 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 20132221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29758727040).

20132221020 is an abundant number, since it is smaller than the sum of its proper divisors (39385233060).

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

20132221020 is a wasteful number, since it uses less digits than its factorization.

20132221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53715 (or 53713 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20132221020 its reverse (2012223102), we get a palindrome (22144444122).

The spelling of 20132221020 in words is "twenty billion, one hundred thirty-two million, two hundred twenty-one thousand, twenty".