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20252009 = 31165119
BaseRepresentation
bin100110101000…
…0010101101001
31102002220112102
41031100111221
520141031014
62002023145
7334065521
oct115202551
942086472
1020252009
11104826a8
126947ab5
13427104b
142992681
151ba08de
hex1350569

20252009 has 4 divisors (see below), whose sum is σ = 20317440. Its totient is φ = 20186580.

The previous prime is 20251993. The next prime is 20252017. The reversal of 20252009 is 90025202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90025202 = 245012601.

It is a cyclic number.

It is not a de Polignac number, because 20252009 - 24 = 20251993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20252509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32249 + ... + 32870.

It is an arithmetic number, because the mean of its divisors is an integer number (5079360).

Almost surely, 220252009 is an apocalyptic number.

It is an amenable number.

20252009 is a deficient number, since it is larger than the sum of its proper divisors (65431).

20252009 is an equidigital number, since it uses as much as digits as its factorization.

20252009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65430.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20252009 is about 4500.2232166860. The cubic root of 20252009 is about 272.5771024422.

The spelling of 20252009 in words is "twenty million, two hundred fifty-two thousand, nine".

Divisors: 1 311 65119 20252009