21297040

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{151}}^1$

素因数の和:248

約数の個数: 80

約数和(自身を含む): 52246656

約数和(自身を除く): 30949616

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 43, 80, 82, 86, 151, 164, 172, 205, 215, 302, 328, 344, 410, 430, 604, 656, 688, 755, 820, 860, 1208, 1510, 1640, 1720, 1763, 2416, 3020, 3280, 3440, 3526, 6040, 6191, 6493, 7052, 8815, 12080, 12382, 12986, 14104, 17630, 24764, 25972, 28208, 30955, 32465, 35260, 49528, 51944, 61910, 64930, 70520, 99056, 103888, 123820, 129860, 141040, 247640, 259720, 266213, 495280, 519440, 532426, 1064852, 1331065, 2129704, 2662130, 4259408, 5324260, 10648520, 21297040]

約数ペア:

[(1, 21297040), (2, 10648520), (4, 5324260), (5, 4259408), (8, 2662130), (10, 2129704), (16, 1331065), (20, 1064852), (40, 532426), (41, 519440), (43, 495280), (80, 266213), (82, 259720), (86, 247640), (151, 141040), (164, 129860), (172, 123820), (205, 103888), (215, 99056), (302, 70520), (328, 64930), (344, 61910), (410, 51944), (430, 49528), (604, 35260), (656, 32465), (688, 30955), (755, 28208), (820, 25972), (860, 24764), (1208, 17630), (1510, 14104), (1640, 12986), (1720, 12382), (1763, 12080), (2416, 8815), (3020, 7052), (3280, 6493), (3440, 6191), (3526, 6040)]