21069680

素因数分解:

$2^4\times 5^1\times {\mathrm{103}}^1\times {\mathrm{2557}}^1$

素因数の和:2673

約数の個数: 40

約数和(自身を含む): 49481952

約数和(自身を除く): 28412272

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 103, 206, 412, 515, 824, 1030, 1648, 2060, 2557, 4120, 5114, 8240, 10228, 12785, 20456, 25570, 40912, 51140, 102280, 204560, 263371, 526742, 1053484, 1316855, 2106968, 2633710, 4213936, 5267420, 10534840, 21069680]

約数ペア:

[(1, 21069680), (2, 10534840), (4, 5267420), (5, 4213936), (8, 2633710), (10, 2106968), (16, 1316855), (20, 1053484), (40, 526742), (80, 263371), (103, 204560), (206, 102280), (412, 51140), (515, 40912), (824, 25570), (1030, 20456), (1648, 12785), (2060, 10228), (2557, 8240), (4120, 5114)]