81179980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{8167}}^1$

素因数の和:8254

約数の個数: 48

約数和(自身を含む): 197600256

約数和(自身を除く): 116420276

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 2485, 4970, 8167, 9940, 16334, 32668, 40835, 57169, 81670, 114338, 163340, 228676, 285845, 571690, 579857, 1143380, 1159714, 2319428, 2899285, 4058999, 5798570, 8117998, 11597140, 16235996, 20294995, 40589990, 81179980]

約数ペア:

[(1, 81179980), (2, 40589990), (4, 20294995), (5, 16235996), (7, 11597140), (10, 8117998), (14, 5798570), (20, 4058999), (28, 2899285), (35, 2319428), (70, 1159714), (71, 1143380), (140, 579857), (142, 571690), (284, 285845), (355, 228676), (497, 163340), (710, 114338), (994, 81670), (1420, 57169), (1988, 40835), (2485, 32668), (4970, 16334), (8167, 9940)]