21309340

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{1999}}^1$

素因数の和:2062

約数の個数: 48

約数和(自身を含む): 49392000

約数和(自身を除く): 28082660

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 41, 52, 65, 82, 130, 164, 205, 260, 410, 533, 820, 1066, 1999, 2132, 2665, 3998, 5330, 7996, 9995, 10660, 19990, 25987, 39980, 51974, 81959, 103948, 129935, 163918, 259870, 327836, 409795, 519740, 819590, 1065467, 1639180, 2130934, 4261868, 5327335, 10654670, 21309340]

約数ペア:

[(1, 21309340), (2, 10654670), (4, 5327335), (5, 4261868), (10, 2130934), (13, 1639180), (20, 1065467), (26, 819590), (41, 519740), (52, 409795), (65, 327836), (82, 259870), (130, 163918), (164, 129935), (205, 103948), (260, 81959), (410, 51974), (533, 39980), (820, 25987), (1066, 19990), (1999, 10660), (2132, 9995), (2665, 7996), (3998, 5330)]