21728840

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{1093}}^1$

素因数の和:1182

約数の個数: 64

約数和(自身を含む): 56712960

約数和(自身を除く): 34984120

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, 1093, 1420, 1988, 2186, 2485, 2840, 3976, 4372, 4970, 5465, 7651, 8744, 9940, 10930, 15302, 19880, 21860, 30604, 38255, 43720, 61208, 76510, 77603, 153020, 155206, 306040, 310412, 388015, 543221, 620824, 776030, 1086442, 1552060, 2172884, 2716105, 3104120, 4345768, 5432210, 10864420, 21728840]

約数ペア:

[(1, 21728840), (2, 10864420), (4, 5432210), (5, 4345768), (7, 3104120), (8, 2716105), (10, 2172884), (14, 1552060), (20, 1086442), (28, 776030), (35, 620824), (40, 543221), (56, 388015), (70, 310412), (71, 306040), (140, 155206), (142, 153020), (280, 77603), (284, 76510), (355, 61208), (497, 43720), (568, 38255), (710, 30604), (994, 21860), (1093, 19880), (1420, 15302), (1988, 10930), (2186, 9940), (2485, 8744), (2840, 7651), (3976, 5465), (4372, 4970)]