21142960

素因数分解:

$2^4\times 5^1\times {\mathrm{127}}^1\times {\mathrm{2081}}^1$

素因数の和:2221

約数の個数: 40

約数和(自身を含む): 49568256

約数和(自身を除く): 28425296

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 127, 254, 508, 635, 1016, 1270, 2032, 2081, 2540, 4162, 5080, 8324, 10160, 10405, 16648, 20810, 33296, 41620, 83240, 166480, 264287, 528574, 1057148, 1321435, 2114296, 2642870, 4228592, 5285740, 10571480, 21142960]

約数ペア:

[(1, 21142960), (2, 10571480), (4, 5285740), (5, 4228592), (8, 2642870), (10, 2114296), (16, 1321435), (20, 1057148), (40, 528574), (80, 264287), (127, 166480), (254, 83240), (508, 41620), (635, 33296), (1016, 20810), (1270, 16648), (2032, 10405), (2081, 10160), (2540, 8324), (4162, 5080)]