20781345

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{79}}^1$

素因数の和:190

約数の個数: 64

約数和(自身を含む): 38707200

約数和(自身を除く): 17925855

約数列:

[1, 3, 5, 13, 15, 19, 39, 57, 65, 71, 79, 95, 195, 213, 237, 247, 285, 355, 395, 741, 923, 1027, 1065, 1185, 1235, 1349, 1501, 2769, 3081, 3705, 4047, 4503, 4615, 5135, 5609, 6745, 7505, 13845, 15405, 16827, 17537, 19513, 20235, 22515, 28045, 52611, 58539, 72917, 84135, 87685, 97565, 106571, 218751, 263055, 292695, 319713, 364585, 532855, 1093755, 1385423, 1598565, 4156269, 6927115, 20781345]

約数ペア:

[(1, 20781345), (3, 6927115), (5, 4156269), (13, 1598565), (15, 1385423), (19, 1093755), (39, 532855), (57, 364585), (65, 319713), (71, 292695), (79, 263055), (95, 218751), (195, 106571), (213, 97565), (237, 87685), (247, 84135), (285, 72917), (355, 58539), (395, 52611), (741, 28045), (923, 22515), (1027, 20235), (1065, 19513), (1185, 17537), (1235, 16827), (1349, 15405), (1501, 13845), (2769, 7505), (3081, 6745), (3705, 5609), (4047, 5135), (4503, 4615)]