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20506075 = 52820243
BaseRepresentation
bin100111000111…
…0010111011011
31102120211001021
41032032113123
520222143300
62011303311
7336204322
oct116162733
942524037
1020506075
1110636577
126a4ab37
13432c895
142a1b0b9
151c00d1a
hex138e5db

20506075 has 6 divisors (see below), whose sum is σ = 25427564. Its totient is φ = 16404840.

The previous prime is 20506067. The next prime is 20506081. The reversal of 20506075 is 57060502.

It is a happy number.

It is not a de Polignac number, because 20506075 - 23 = 20506067 is a prime.

It is a super-2 number, since 2×205060752 = 840998223811250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 820243 = 20506075 / (2 + 0 + 5 + 0 + 6 + 0 + 7 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 410097 + ... + 410146.

Almost surely, 220506075 is an apocalyptic number.

20506075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20506075 is a deficient number, since it is larger than the sum of its proper divisors (4921489).

20506075 is an equidigital number, since it uses as much as digits as its factorization.

20506075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820253 (or 820248 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20506075 is about 4528.3633908952. The cubic root of 20506075 is about 273.7122158258.

Adding to 20506075 its reverse (57060502), we get a palindrome (77566577).

The spelling of 20506075 in words is "twenty million, five hundred six thousand, seventy-five".

Divisors: 1 5 25 820243 4101215 20506075