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20612161 = 35415821
BaseRepresentation
bin100111010100…
…0010001000001
31102210012120101
41032220101001
520234042121
62013442401
7340125523
oct116502101
942705511
1020612161
11106a9249
126aa0401
134368c5b
142a47a13
151c22491
hex13a8441

20612161 has 4 divisors (see below), whose sum is σ = 20621524. Its totient is φ = 20602800.

The previous prime is 20612149. The next prime is 20612167. The reversal of 20612161 is 16121602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13690000 + 6922161 = 3700^2 + 2631^2 .

It is a cyclic number.

It is not a de Polignac number, because 20612161 - 25 = 20612129 is a prime.

It is a super-2 number, since 2×206121612 = 849722362179842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20612167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 631 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (5155381).

Almost surely, 220612161 is an apocalyptic number.

It is an amenable number.

20612161 is a deficient number, since it is larger than the sum of its proper divisors (9363).

20612161 is an equidigital number, since it uses as much as digits as its factorization.

20612161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9362.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20612161 is about 4540.0617837206. The cubic root of 20612161 is about 274.1834112189.

Adding to 20612161 its reverse (16121602), we get a palindrome (36733763).

The spelling of 20612161 in words is "twenty million, six hundred twelve thousand, one hundred sixty-one".

Divisors: 1 3541 5821 20612161