20280125 has 16 divisors (see below), whose sum is σ = 26644800. Its totient is φ = 15368400.

The previous prime is 20280119. The next prime is 20280149. The reversal of 20280125 is 52108202.

It is not a de Polignac number, because 20280125 - 2⁴ = 20280109 is a prime.

It is a super-2 number, since 2×20280125² = 822566940031250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20280097 and 20280106.

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, 1895 + ... + 6644.

It is an arithmetic number, because the mean of its divisors is an integer number (1665300).

Almost surely, 2^20280125 is an apocalyptic number.

20280125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20280125 is a deficient number, since it is larger than the sum of its proper divisors (6364675).

20280125 is an equidigital number, since it uses as much as digits as its factorization.

20280125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8573 (or 8563 counting only the distinct ones).

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

The square root of 20280125 is about 4503.3459782699. The cubic root of 20280125 is about 272.7031843203.

Adding to 20280125 its reverse (52108202), we get a palindrome (72388327).

The spelling of 20280125 in words is "twenty million, two hundred eighty thousand, one hundred twenty-five".