21891990

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{193}}^1\times {\mathrm{199}}^1$

素因数の和:421

約数の個数: 64

約数和(自身を含む): 55872000

約数和(自身を除く): 33980010

約数列:

[1, 2, 3, 5, 6, 10, 15, 19, 30, 38, 57, 95, 114, 190, 193, 199, 285, 386, 398, 570, 579, 597, 965, 995, 1158, 1194, 1930, 1990, 2895, 2985, 3667, 3781, 5790, 5970, 7334, 7562, 11001, 11343, 18335, 18905, 22002, 22686, 36670, 37810, 38407, 55005, 56715, 76814, 110010, 113430, 115221, 192035, 230442, 384070, 576105, 729733, 1152210, 1459466, 2189199, 3648665, 4378398, 7297330, 10945995, 21891990]

約数ペア:

[(1, 21891990), (2, 10945995), (3, 7297330), (5, 4378398), (6, 3648665), (10, 2189199), (15, 1459466), (19, 1152210), (30, 729733), (38, 576105), (57, 384070), (95, 230442), (114, 192035), (190, 115221), (193, 113430), (199, 110010), (285, 76814), (386, 56715), (398, 55005), (570, 38407), (579, 37810), (597, 36670), (965, 22686), (995, 22002), (1158, 18905), (1194, 18335), (1930, 11343), (1990, 11001), (2895, 7562), (2985, 7334), (3667, 5970), (3781, 5790)]