21251720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{1069}}^1$

素因数の和:1158

約数の個数: 64

約数和(自身を含む): 55468800

約数和(自身を除く): 34217080

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 71, 140, 142, 280, 284, 355, 497, 568, 710, 994, 1069, 1420, 1988, 2138, 2485, 2840, 3976, 4276, 4970, 5345, 7483, 8552, 9940, 10690, 14966, 19880, 21380, 29932, 37415, 42760, 59864, 74830, 75899, 149660, 151798, 299320, 303596, 379495, 531293, 607192, 758990, 1062586, 1517980, 2125172, 2656465, 3035960, 4250344, 5312930, 10625860, 21251720]

約数ペア:

[(1, 21251720), (2, 10625860), (4, 5312930), (5, 4250344), (7, 3035960), (8, 2656465), (10, 2125172), (14, 1517980), (20, 1062586), (28, 758990), (35, 607192), (40, 531293), (56, 379495), (70, 303596), (71, 299320), (140, 151798), (142, 149660), (280, 75899), (284, 74830), (355, 59864), (497, 42760), (568, 37415), (710, 29932), (994, 21380), (1069, 19880), (1420, 14966), (1988, 10690), (2138, 9940), (2485, 8552), (2840, 7483), (3976, 5345), (4276, 4970)]