20125820 has 96 divisors (see below), whose sum is σ = 51480576. Its totient is φ = 6508800.

The previous prime is 20125799. The next prime is 20125829. The reversal of 20125820 is 2852102.

20125820 = T₃₁₃ + T₃₁₄ + ... + T₅₃₂.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20125792 and 20125801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20125829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88547 + ... + 88773.

It is an arithmetic number, because the mean of its divisors is an integer number (536256).

Almost surely, 2^20125820 is an apocalyptic number.

20125820 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 20125820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25740288).

20125820 is an abundant number, since it is smaller than the sum of its proper divisors (31354756).

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

20125820 is a wasteful number, since it uses less digits than its factorization.

20125820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20125820 is about 4486.1810039275. The cubic root of 20125820 is about 272.0097855476.

Adding to 20125820 its reverse (2852102), we get a palindrome (22977922).

The spelling of 20125820 in words is "twenty million, one hundred twenty-five thousand, eight hundred twenty".