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20802125 = 53166417
BaseRepresentation
bin100111101011…
…0101001001101
31110010212011002
41033112221031
520311132000
62021510045
7341546411
oct117265115
943125132
1020802125
1110818a43
126b72325
134404566
142a96d41
151c5d8d5
hex13d6a4d

20802125 has 8 divisors (see below), whose sum is σ = 25961208. Its totient is φ = 16641600.

The previous prime is 20802113. The next prime is 20802137. The reversal of 20802125 is 52120802.

It is an interprime number because it is at equal distance from previous prime (20802113) and next prime (20802137).

It can be written as a sum of positive squares in 4 ways, for example, as 5207524 + 15594601 = 2282^2 + 3949^2 .

It is not a de Polignac number, because 20802125 - 210 = 20801101 is a prime.

It is a house number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20802097 and 20802106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83084 + ... + 83333.

It is an arithmetic number, because the mean of its divisors is an integer number (3245151).

Almost surely, 220802125 is an apocalyptic number.

20802125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20802125 is a deficient number, since it is larger than the sum of its proper divisors (5159083).

20802125 is an equidigital number, since it uses as much as digits as its factorization.

20802125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166432 (or 166422 counting only the distinct ones).

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

The square root of 20802125 is about 4560.9346629830. The cubic root of 20802125 is about 275.0231385489.

Adding to 20802125 its reverse (52120802), we get a palindrome (72922927).

The spelling of 20802125 in words is "twenty million, eight hundred two thousand, one hundred twenty-five".

Divisors: 1 5 25 125 166417 832085 4160425 20802125