19700720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{997}}^1$

素因数の和:1042

約数の個数: 80

約数和(自身を含む): 51975840

約数和(自身を除く): 32275120

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 19, 20, 26, 38, 40, 52, 65, 76, 80, 95, 104, 130, 152, 190, 208, 247, 260, 304, 380, 494, 520, 760, 988, 997, 1040, 1235, 1520, 1976, 1994, 2470, 3952, 3988, 4940, 4985, 7976, 9880, 9970, 12961, 15952, 18943, 19760, 19940, 25922, 37886, 39880, 51844, 64805, 75772, 79760, 94715, 103688, 129610, 151544, 189430, 207376, 246259, 259220, 303088, 378860, 492518, 518440, 757720, 985036, 1036880, 1231295, 1515440, 1970072, 2462590, 3940144, 4925180, 9850360, 19700720]

約数ペア:

[(1, 19700720), (2, 9850360), (4, 4925180), (5, 3940144), (8, 2462590), (10, 1970072), (13, 1515440), (16, 1231295), (19, 1036880), (20, 985036), (26, 757720), (38, 518440), (40, 492518), (52, 378860), (65, 303088), (76, 259220), (80, 246259), (95, 207376), (104, 189430), (130, 151544), (152, 129610), (190, 103688), (208, 94715), (247, 79760), (260, 75772), (304, 64805), (380, 51844), (494, 39880), (520, 37886), (760, 25922), (988, 19940), (997, 19760), (1040, 18943), (1235, 15952), (1520, 12961), (1976, 9970), (1994, 9880), (2470, 7976), (3952, 4985), (3988, 4940)]