21498280

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{431}}^1$

素因数の和:514

約数の個数: 64

約数和(自身を含む): 51321600

約数和(自身を除く): 29823320

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 43, 58, 86, 116, 145, 172, 215, 232, 290, 344, 430, 431, 580, 860, 862, 1160, 1247, 1720, 1724, 2155, 2494, 3448, 4310, 4988, 6235, 8620, 9976, 12470, 12499, 17240, 18533, 24940, 24998, 37066, 49880, 49996, 62495, 74132, 92665, 99992, 124990, 148264, 185330, 249980, 370660, 499960, 537457, 741320, 1074914, 2149828, 2687285, 4299656, 5374570, 10749140, 21498280]

約数ペア:

[(1, 21498280), (2, 10749140), (4, 5374570), (5, 4299656), (8, 2687285), (10, 2149828), (20, 1074914), (29, 741320), (40, 537457), (43, 499960), (58, 370660), (86, 249980), (116, 185330), (145, 148264), (172, 124990), (215, 99992), (232, 92665), (290, 74132), (344, 62495), (430, 49996), (431, 49880), (580, 37066), (860, 24998), (862, 24940), (1160, 18533), (1247, 17240), (1720, 12499), (1724, 12470), (2155, 9976), (2494, 8620), (3448, 6235), (4310, 4988)]