20727980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{1627}}^1$

素因数の和:1663

約数の個数: 72

約数和(自身を含む): 54564048

約数和(自身を除く): 33836068

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 49, 52, 65, 70, 91, 98, 130, 140, 182, 196, 245, 260, 364, 455, 490, 637, 910, 980, 1274, 1627, 1820, 2548, 3185, 3254, 6370, 6508, 8135, 11389, 12740, 16270, 21151, 22778, 32540, 42302, 45556, 56945, 79723, 84604, 105755, 113890, 148057, 159446, 211510, 227780, 296114, 318892, 398615, 423020, 592228, 740285, 797230, 1036399, 1480570, 1594460, 2072798, 2961140, 4145596, 5181995, 10363990, 20727980]

約数ペア:

[(1, 20727980), (2, 10363990), (4, 5181995), (5, 4145596), (7, 2961140), (10, 2072798), (13, 1594460), (14, 1480570), (20, 1036399), (26, 797230), (28, 740285), (35, 592228), (49, 423020), (52, 398615), (65, 318892), (70, 296114), (91, 227780), (98, 211510), (130, 159446), (140, 148057), (182, 113890), (196, 105755), (245, 84604), (260, 79723), (364, 56945), (455, 45556), (490, 42302), (637, 32540), (910, 22778), (980, 21151), (1274, 16270), (1627, 12740), (1820, 11389), (2548, 8135), (3185, 6508), (3254, 6370)]