21439720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{769}}^1$

素因数の和:838

約数の個数: 64

約数和(自身を含む): 52390800

約数和(自身を除く): 30951080

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 41, 68, 82, 85, 136, 164, 170, 205, 328, 340, 410, 680, 697, 769, 820, 1394, 1538, 1640, 2788, 3076, 3485, 3845, 5576, 6152, 6970, 7690, 13073, 13940, 15380, 26146, 27880, 30760, 31529, 52292, 63058, 65365, 104584, 126116, 130730, 157645, 252232, 261460, 315290, 522920, 535993, 630580, 1071986, 1261160, 2143972, 2679965, 4287944, 5359930, 10719860, 21439720]

約数ペア:

[(1, 21439720), (2, 10719860), (4, 5359930), (5, 4287944), (8, 2679965), (10, 2143972), (17, 1261160), (20, 1071986), (34, 630580), (40, 535993), (41, 522920), (68, 315290), (82, 261460), (85, 252232), (136, 157645), (164, 130730), (170, 126116), (205, 104584), (328, 65365), (340, 63058), (410, 52292), (680, 31529), (697, 30760), (769, 27880), (820, 26146), (1394, 15380), (1538, 13940), (1640, 13073), (2788, 7690), (3076, 6970), (3485, 6152), (3845, 5576)]