21437780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{11779}}^1$

素因数の和:11808

約数の個数: 48

約数和(自身を含む): 55413120

約数和(自身を除く): 33975340

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820, 11779, 23558, 47116, 58895, 82453, 117790, 153127, 164906, 235580, 306254, 329812, 412265, 612508, 765635, 824530, 1071889, 1531270, 1649060, 2143778, 3062540, 4287556, 5359445, 10718890, 21437780]

約数ペア:

[(1, 21437780), (2, 10718890), (4, 5359445), (5, 4287556), (7, 3062540), (10, 2143778), (13, 1649060), (14, 1531270), (20, 1071889), (26, 824530), (28, 765635), (35, 612508), (52, 412265), (65, 329812), (70, 306254), (91, 235580), (130, 164906), (140, 153127), (182, 117790), (260, 82453), (364, 58895), (455, 47116), (910, 23558), (1820, 11779)]