19897990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{727}}^1$

素因数の和:781

約数の個数: 64

約数和(自身を含む): 45287424

約数和(自身を除く): 25389434

約数列:

[1, 2, 5, 7, 10, 14, 17, 23, 34, 35, 46, 70, 85, 115, 119, 161, 170, 230, 238, 322, 391, 595, 727, 782, 805, 1190, 1454, 1610, 1955, 2737, 3635, 3910, 5089, 5474, 7270, 10178, 12359, 13685, 16721, 24718, 25445, 27370, 33442, 50890, 61795, 83605, 86513, 117047, 123590, 167210, 173026, 234094, 284257, 432565, 568514, 585235, 865130, 1170470, 1421285, 1989799, 2842570, 3979598, 9948995, 19897990]

約数ペア:

[(1, 19897990), (2, 9948995), (5, 3979598), (7, 2842570), (10, 1989799), (14, 1421285), (17, 1170470), (23, 865130), (34, 585235), (35, 568514), (46, 432565), (70, 284257), (85, 234094), (115, 173026), (119, 167210), (161, 123590), (170, 117047), (230, 86513), (238, 83605), (322, 61795), (391, 50890), (595, 33442), (727, 27370), (782, 25445), (805, 24718), (1190, 16721), (1454, 13685), (1610, 12359), (1955, 10178), (2737, 7270), (3635, 5474), (3910, 5089)]