21992005

素因数分解:

$5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{461}}^1$

素因数の和:549

約数の個数: 32

約数和(自身を含む): 31933440

約数和(自身を除く): 9941435

約数列:

[1, 5, 7, 29, 35, 47, 145, 203, 235, 329, 461, 1015, 1363, 1645, 2305, 3227, 6815, 9541, 13369, 16135, 21667, 47705, 66845, 93583, 108335, 151669, 467915, 628343, 758345, 3141715, 4398401, 21992005]

約数ペア:

[(1, 21992005), (5, 4398401), (7, 3141715), (29, 758345), (35, 628343), (47, 467915), (145, 151669), (203, 108335), (235, 93583), (329, 66845), (461, 47705), (1015, 21667), (1363, 16135), (1645, 13369), (2305, 9541), (3227, 6815)]