20125620 has 72 divisors (see below), whose sum is σ = 64648584. Its totient is φ = 5050368.

The previous prime is 20125613. The next prime is 20125627. The reversal of 20125620 is 2652102.

20125620 is a `hidden beast` number, since 20 + 1 + 25 + 620 = 666.

It is an interprime number because it is at equal distance from previous prime (20125613) and next prime (20125627).

It can be written as a sum of positive squares in 4 ways, for example, as 10614564 + 9511056 = 3258^2 + 3084^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20125593 and 20125602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125627) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 229 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (897897).

Almost surely, 2^20125620 is an apocalyptic number.

20125620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20125620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32324292).

20125620 is an abundant number, since it is smaller than the sum of its proper divisors (44522964).

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

20125620 is a wasteful number, since it uses less digits than its factorization.

20125620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6609 (or 6604 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20125620 is about 4486.1587131977. The cubic root of 20125620 is about 272.0088845137.

Adding to 20125620 its reverse (2652102), we get a palindrome (22777722).

The spelling of 20125620 in words is "twenty million, one hundred twenty-five thousand, six hundred twenty".