20125105500 has 48 divisors (see below), whose sum is σ = 58604311584. Its totient is φ = 5366694400.

The previous prime is 20125105499. The next prime is 20125105549. The reversal of 20125105500 is 550152102.

It is a super-2 number, since 2×20125105500² (a number of 21 digits) contains 22 as substring.

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, 6706869 + ... + 6709868.

It is an arithmetic number, because the mean of its divisors is an integer number (1220923158).

Almost surely, 2^20125105500 is an apocalyptic number.

20125105500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20125105500 is an abundant number, since it is smaller than the sum of its proper divisors (38479206084).

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

20125105500 is a wasteful number, since it uses less digits than its factorization.

20125105500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13416759 (or 13416747 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

Adding to 20125105500 its reverse (550152102), we get a palindrome (20675257602).

The spelling of 20125105500 in words is "twenty billion, one hundred twenty-five million, one hundred five thousand, five hundred".