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20678049 = 327246889
BaseRepresentation
bin100111011100…
…0010110100001
31102220112221200
41032320112201
520243144144
62015111413
7340521600
oct116702641
942815850
1020678049
11107437a7
126b12569
13438cc42
142a63a37
151c36c69
hex13b85a1

20678049 has 18 divisors (see below), whose sum is σ = 34745490. Its totient is φ = 11815776.

The previous prime is 20678027. The next prime is 20678059. The reversal of 20678049 is 94087602.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 3038049 = 4200^2 + 1743^2 .

It is not a de Polignac number, because 20678049 - 28 = 20677793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20678059) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23004 + ... + 23885.

It is an arithmetic number, because the mean of its divisors is an integer number (1930305).

Almost surely, 220678049 is an apocalyptic number.

It is an amenable number.

20678049 is a deficient number, since it is larger than the sum of its proper divisors (14067441).

20678049 is a wasteful number, since it uses less digits than its factorization.

20678049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46909 (or 46899 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20678049 is about 4547.3122830965. The cubic root of 20678049 is about 274.4752483480.

The spelling of 20678049 in words is "twenty million, six hundred seventy-eight thousand, forty-nine".

Divisors: 1 3 7 9 21 49 63 147 441 46889 140667 328223 422001 984669 2297561 2954007 6892683 20678049