20181980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^2\times {\mathrm{853}}^1$

素因数の和:895

約数の個数: 72

約数和(自身を含む): 52510752

約数和(自身を除く): 32328772

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 169, 182, 260, 338, 364, 455, 676, 845, 853, 910, 1183, 1690, 1706, 1820, 2366, 3380, 3412, 4265, 4732, 5915, 5971, 8530, 11089, 11830, 11942, 17060, 22178, 23660, 23884, 29855, 44356, 55445, 59710, 77623, 110890, 119420, 144157, 155246, 221780, 288314, 310492, 388115, 576628, 720785, 776230, 1009099, 1441570, 1552460, 2018198, 2883140, 4036396, 5045495, 10090990, 20181980]

約数ペア:

[(1, 20181980), (2, 10090990), (4, 5045495), (5, 4036396), (7, 2883140), (10, 2018198), (13, 1552460), (14, 1441570), (20, 1009099), (26, 776230), (28, 720785), (35, 576628), (52, 388115), (65, 310492), (70, 288314), (91, 221780), (130, 155246), (140, 144157), (169, 119420), (182, 110890), (260, 77623), (338, 59710), (364, 55445), (455, 44356), (676, 29855), (845, 23884), (853, 23660), (910, 22178), (1183, 17060), (1690, 11942), (1706, 11830), (1820, 11089), (2366, 8530), (3380, 5971), (3412, 5915), (4265, 4732)]