20125680 has 40 divisors (see below), whose sum is σ = 62390352. Its totient is φ = 5366784.

The previous prime is 20125649. The next prime is 20125697. The reversal of 20125680 is 8652102.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20125680.

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 7 ways as a sum of consecutive naturals, for example, 41689 + ... + 42168.

Almost surely, 2^20125680 is an apocalyptic number.

20125680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20125680 is an abundant number, since it is smaller than the sum of its proper divisors (42264672).

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

20125680 is a wasteful number, since it uses less digits than its factorization.

20125680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83873 (or 83867 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 20125680 is about 4486.1654004283. The cubic root of 20125680 is about 272.0091548245.

Adding to 20125680 its reverse (8652102), we get a palindrome (28777782).

The spelling of 20125680 in words is "twenty million, one hundred twenty-five thousand, six hundred eighty".