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20618269 = 72420781
BaseRepresentation
bin100111010100…
…1110000011101
31102210111221121
41032221300131
520234241034
62013530541
7340152400
oct116516035
942714847
1020618269
11107028a1
126aa3a51
13436b979
142a49d37
151c241b4
hex13a9c1d

20618269 has 6 divisors (see below), whose sum is σ = 23984574. Its totient is φ = 17672760.

The previous prime is 20618261. The next prime is 20618293. The reversal of 20618269 is 96281602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 2683044 = 4235^2 + 1638^2 .

It is not a de Polignac number, because 20618269 - 23 = 20618261 is a prime.

It is a super-2 number, since 2×206182692 = 850226033112722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210342 + ... + 210439.

It is an arithmetic number, because the mean of its divisors is an integer number (3997429).

Almost surely, 220618269 is an apocalyptic number.

It is an amenable number.

20618269 is a deficient number, since it is larger than the sum of its proper divisors (3366305).

20618269 is an equidigital number, since it uses as much as digits as its factorization.

20618269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420795 (or 420788 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20618269 is about 4540.7344119647. The cubic root of 20618269 is about 274.2104914602.

The spelling of 20618269 in words is "twenty million, six hundred eighteen thousand, two hundred sixty-nine".

Divisors: 1 7 49 420781 2945467 20618269