20105143520 has 96 divisors (see below), whose sum is σ = 59218822656. Its totient is φ = 6266534400.

The previous prime is 20105143477. The next prime is 20105143547. The reversal of 20105143520 is 2534150102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 803636 + ... + 828275.

It is an arithmetic number, because the mean of its divisors is an integer number (616862736).

Almost surely, 2^20105143520 is an apocalyptic number.

20105143520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20105143520 is an abundant number, since it is smaller than the sum of its proper divisors (39113679136).

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

20105143520 is a wasteful number, since it uses less digits than its factorization.

20105143520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631944 (or 1631936 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 20105143520 its reverse (2534150102), we get a palindrome (22639293622).

The spelling of 20105143520 in words is "twenty billion, one hundred five million, one hundred forty-three thousand, five hundred twenty".