20021220232 has 32 divisors (see below), whose sum is σ = 40577808600. Its totient is φ = 9206198784.

The previous prime is 20021220217. The next prime is 20021220377. The reversal of 20021220232 is 23202212002.

It can be written as a sum of positive squares in 4 ways, for example, as 11675666916 + 8345553316 = 108054^2 + 91354^2 .

It is a super-2 number, since 2×20021220232² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329853 + ... + 385804.

Almost surely, 2^20021220232 is an apocalyptic number.

It is an amenable number.

20021220232 is an abundant number, since it is smaller than the sum of its proper divisors (20556588368).

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

20021220232 is a wasteful number, since it uses less digits than its factorization.

20021220232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715945 (or 715941 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20021220232 its reverse (23202212002), we get a palindrome (43223432234).

The spelling of 20021220232 in words is "twenty billion, twenty-one million, two hundred twenty thousand, two hundred thirty-two".