21757240

素因数分解:

$2^3\times 5^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1\times {\mathrm{163}}^1$

素因数の和:292

約数の個数: 64

約数和(自身を含む): 51010560

約数和(自身を除く): 29253320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 47, 71, 94, 142, 163, 188, 235, 284, 326, 355, 376, 470, 568, 652, 710, 815, 940, 1304, 1420, 1630, 1880, 2840, 3260, 3337, 6520, 6674, 7661, 11573, 13348, 15322, 16685, 23146, 26696, 30644, 33370, 38305, 46292, 57865, 61288, 66740, 76610, 92584, 115730, 133480, 153220, 231460, 306440, 462920, 543931, 1087862, 2175724, 2719655, 4351448, 5439310, 10878620, 21757240]

約数ペア:

[(1, 21757240), (2, 10878620), (4, 5439310), (5, 4351448), (8, 2719655), (10, 2175724), (20, 1087862), (40, 543931), (47, 462920), (71, 306440), (94, 231460), (142, 153220), (163, 133480), (188, 115730), (235, 92584), (284, 76610), (326, 66740), (355, 61288), (376, 57865), (470, 46292), (568, 38305), (652, 33370), (710, 30644), (815, 26696), (940, 23146), (1304, 16685), (1420, 15322), (1630, 13348), (1880, 11573), (2840, 7661), (3260, 6674), (3337, 6520)]