18909880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^2\times {\mathrm{3907}}^1$

素因数の和:3940

約数の個数: 48

約数和(自身を含む): 46778760

約数和(自身を除く): 27868880

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 121, 220, 242, 440, 484, 605, 968, 1210, 2420, 3907, 4840, 7814, 15628, 19535, 31256, 39070, 42977, 78140, 85954, 156280, 171908, 214885, 343816, 429770, 472747, 859540, 945494, 1719080, 1890988, 2363735, 3781976, 4727470, 9454940, 18909880]

約数ペア:

[(1, 18909880), (2, 9454940), (4, 4727470), (5, 3781976), (8, 2363735), (10, 1890988), (11, 1719080), (20, 945494), (22, 859540), (40, 472747), (44, 429770), (55, 343816), (88, 214885), (110, 171908), (121, 156280), (220, 85954), (242, 78140), (440, 42977), (484, 39070), (605, 31256), (968, 19535), (1210, 15628), (2420, 7814), (3907, 4840)]