21301917

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{157}}^1$

素因数の和:258

約数の個数: 48

約数和(自身を含む): 36312192

約数和(自身を除く): 15010275

約数列:

[1, 3, 7, 13, 21, 39, 49, 71, 91, 147, 157, 213, 273, 471, 497, 637, 923, 1099, 1491, 1911, 2041, 2769, 3297, 3479, 6123, 6461, 7693, 10437, 11147, 14287, 19383, 23079, 33441, 42861, 45227, 78029, 100009, 135681, 144911, 234087, 300027, 434733, 546203, 1014377, 1638609, 3043131, 7100639, 21301917]

約数ペア:

[(1, 21301917), (3, 7100639), (7, 3043131), (13, 1638609), (21, 1014377), (39, 546203), (49, 434733), (71, 300027), (91, 234087), (147, 144911), (157, 135681), (213, 100009), (273, 78029), (471, 45227), (497, 42861), (637, 33441), (923, 23079), (1099, 19383), (1491, 14287), (1911, 11147), (2041, 10437), (2769, 7693), (3297, 6461), (3479, 6123)]