20205221512 has 32 divisors (see below), whose sum is σ = 43307363520. Its totient is φ = 8657288640.

The previous prime is 20205221489. The next prime is 20205221513. The reversal of 20205221512 is 21512250202.

It is a super-2 number, since 2×20205221512² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20205221513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202587 + ... + 285397.

It is an arithmetic number, because the mean of its divisors is an integer number (1353355110).

Almost surely, 2^20205221512 is an apocalyptic number.

It is an amenable number.

20205221512 is an abundant number, since it is smaller than the sum of its proper divisors (23102142008).

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

20205221512 is a wasteful number, since it uses less digits than its factorization.

20205221512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87181 (or 87177 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 20205221512 its reverse (21512250202), we get a palindrome (41717471714).

The spelling of 20205221512 in words is "twenty billion, two hundred five million, two hundred twenty-one thousand, five hundred twelve".