19871980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{211}}^1\times {\mathrm{277}}^1$

素因数の和:514

約数の個数: 48

約数和(自身を含む): 44555616

約数和(自身を除く): 24683636

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 211, 277, 340, 422, 554, 844, 1055, 1108, 1385, 2110, 2770, 3587, 4220, 4709, 5540, 7174, 9418, 14348, 17935, 18836, 23545, 35870, 47090, 58447, 71740, 94180, 116894, 233788, 292235, 584470, 993599, 1168940, 1987198, 3974396, 4967995, 9935990, 19871980]

約数ペア:

[(1, 19871980), (2, 9935990), (4, 4967995), (5, 3974396), (10, 1987198), (17, 1168940), (20, 993599), (34, 584470), (68, 292235), (85, 233788), (170, 116894), (211, 94180), (277, 71740), (340, 58447), (422, 47090), (554, 35870), (844, 23545), (1055, 18836), (1108, 17935), (1385, 14348), (2110, 9418), (2770, 7174), (3587, 5540), (4220, 4709)]