20117960

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{103}}^1\times {\mathrm{257}}^1$

素因数の和:390

約数の個数: 64

約数和(自身を含む): 48297600

約数和(自身を除く): 28179640

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 103, 152, 190, 206, 257, 380, 412, 514, 515, 760, 824, 1028, 1030, 1285, 1957, 2056, 2060, 2570, 3914, 4120, 4883, 5140, 7828, 9766, 9785, 10280, 15656, 19532, 19570, 24415, 26471, 39064, 39140, 48830, 52942, 78280, 97660, 105884, 132355, 195320, 211768, 264710, 502949, 529420, 1005898, 1058840, 2011796, 2514745, 4023592, 5029490, 10058980, 20117960]

約数ペア:

[(1, 20117960), (2, 10058980), (4, 5029490), (5, 4023592), (8, 2514745), (10, 2011796), (19, 1058840), (20, 1005898), (38, 529420), (40, 502949), (76, 264710), (95, 211768), (103, 195320), (152, 132355), (190, 105884), (206, 97660), (257, 78280), (380, 52942), (412, 48830), (514, 39140), (515, 39064), (760, 26471), (824, 24415), (1028, 19570), (1030, 19532), (1285, 15656), (1957, 10280), (2056, 9785), (2060, 9766), (2570, 7828), (3914, 5140), (4120, 4883)]