20811420

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{83}}^1\times {\mathrm{199}}^1$

素因数の和:304

約数の個数: 144

約数和(自身を含む): 73382400

約数和(自身を除く): 52570980

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 83, 84, 90, 105, 126, 140, 166, 180, 199, 210, 249, 252, 315, 332, 398, 415, 420, 498, 581, 597, 630, 747, 796, 830, 995, 996, 1162, 1194, 1245, 1260, 1393, 1494, 1660, 1743, 1791, 1990, 2324, 2388, 2490, 2786, 2905, 2985, 2988, 3486, 3582, 3735, 3980, 4179, 4980, 5229, 5572, 5810, 5970, 6965, 6972, 7164, 7470, 8358, 8715, 8955, 10458, 11620, 11940, 12537, 13930, 14940, 16517, 16716, 17430, 17910, 20895, 20916, 25074, 26145, 27860, 33034, 34860, 35820, 41790, 49551, 50148, 52290, 62685, 66068, 82585, 83580, 99102, 104580, 115619, 125370, 148653, 165170, 198204, 231238, 247755, 250740, 297306, 330340, 346857, 462476, 495510, 578095, 594612, 693714, 743265, 991020, 1040571, 1156190, 1387428, 1486530, 1734285, 2081142, 2312380, 2973060, 3468570, 4162284, 5202855, 6937140, 10405710, 20811420]

約数ペア:

[(1, 20811420), (2, 10405710), (3, 6937140), (4, 5202855), (5, 4162284), (6, 3468570), (7, 2973060), (9, 2312380), (10, 2081142), (12, 1734285), (14, 1486530), (15, 1387428), (18, 1156190), (20, 1040571), (21, 991020), (28, 743265), (30, 693714), (35, 594612), (36, 578095), (42, 495510), (45, 462476), (60, 346857), (63, 330340), (70, 297306), (83, 250740), (84, 247755), (90, 231238), (105, 198204), (126, 165170), (140, 148653), (166, 125370), (180, 115619), (199, 104580), (210, 99102), (249, 83580), (252, 82585), (315, 66068), (332, 62685), (398, 52290), (415, 50148), (420, 49551), (498, 41790), (581, 35820), (597, 34860), (630, 33034), (747, 27860), (796, 26145), (830, 25074), (995, 20916), (996, 20895), (1162, 17910), (1194, 17430), (1245, 16716), (1260, 16517), (1393, 14940), (1494, 13930), (1660, 12537), (1743, 11940), (1791, 11620), (1990, 10458), (2324, 8955), (2388, 8715), (2490, 8358), (2786, 7470), (2905, 7164), (2985, 6972), (2988, 6965), (3486, 5970), (3582, 5810), (3735, 5572), (3980, 5229), (4179, 4980)]