20125500 has 48 divisors (see below), whose sum is σ = 58609824. Its totient is φ = 5366400.

The previous prime is 20125471. The next prime is 20125513. The reversal of 20125500 is 552102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20125500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5209 + ... + 8208.

It is an arithmetic number, because the mean of its divisors is an integer number (1221038).

Almost surely, 2^20125500 is an apocalyptic number.

20125500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20125500 is an abundant number, since it is smaller than the sum of its proper divisors (38484324).

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

20125500 is a wasteful number, since it uses less digits than its factorization.

20125500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13439 (or 13427 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 20125500 is about 4486.1453387067. The cubic root of 20125500 is about 272.0083438905.

Adding to 20125500 its reverse (552102), we get a palindrome (20677602).

The spelling of 20125500 in words is "twenty million, one hundred twenty-five thousand, five hundred".