20516125 has 16 divisors (see below), whose sum is σ = 29263104. Its totient is φ = 14067600.

The previous prime is 20516123. The next prime is 20516147. The reversal of 20516125 is 52161502.

It is not a de Polignac number, because 20516125 - 2¹ = 20516123 is a prime.

It is a super-2 number, since 2×20516125² = 841822770031250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20516096 and 20516105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10849 + ... + 12598.

It is an arithmetic number, because the mean of its divisors is an integer number (1828944).

Almost surely, 2^20516125 is an apocalyptic number.

20516125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20516125 is a deficient number, since it is larger than the sum of its proper divisors (8746979).

20516125 is an equidigital number, since it uses as much as digits as its factorization.

20516125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23469 (or 23459 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 20516125 is about 4529.4729273945. The cubic root of 20516125 is about 273.7569238534.

Adding to 20516125 its reverse (52161502), we get a palindrome (72677627).

The spelling of 20516125 in words is "twenty million, five hundred sixteen thousand, one hundred twenty-five".