81812920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{149}}^1$

素因数の和:257

約数の個数: 128

約数和(自身を含む): 221616000

約数和(自身を除く): 139803080

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 37, 40, 53, 56, 70, 74, 106, 140, 148, 149, 185, 212, 259, 265, 280, 296, 298, 370, 371, 424, 518, 530, 596, 740, 742, 745, 1036, 1043, 1060, 1192, 1295, 1480, 1484, 1490, 1855, 1961, 2072, 2086, 2120, 2590, 2968, 2980, 3710, 3922, 4172, 5180, 5215, 5513, 5960, 7420, 7844, 7897, 8344, 9805, 10360, 10430, 11026, 13727, 14840, 15688, 15794, 19610, 20860, 22052, 27454, 27565, 31588, 38591, 39220, 39485, 41720, 44104, 54908, 55130, 55279, 63176, 68635, 77182, 78440, 78970, 109816, 110260, 110558, 137270, 154364, 157940, 192955, 220520, 221116, 274540, 276395, 292189, 308728, 315880, 385910, 442232, 549080, 552790, 584378, 771820, 1105580, 1168756, 1460945, 1543640, 2045323, 2211160, 2337512, 2921890, 4090646, 5843780, 8181292, 10226615, 11687560, 16362584, 20453230, 40906460, 81812920]

約数ペア:

[(1, 81812920), (2, 40906460), (4, 20453230), (5, 16362584), (7, 11687560), (8, 10226615), (10, 8181292), (14, 5843780), (20, 4090646), (28, 2921890), (35, 2337512), (37, 2211160), (40, 2045323), (53, 1543640), (56, 1460945), (70, 1168756), (74, 1105580), (106, 771820), (140, 584378), (148, 552790), (149, 549080), (185, 442232), (212, 385910), (259, 315880), (265, 308728), (280, 292189), (296, 276395), (298, 274540), (370, 221116), (371, 220520), (424, 192955), (518, 157940), (530, 154364), (596, 137270), (740, 110558), (742, 110260), (745, 109816), (1036, 78970), (1043, 78440), (1060, 77182), (1192, 68635), (1295, 63176), (1480, 55279), (1484, 55130), (1490, 54908), (1855, 44104), (1961, 41720), (2072, 39485), (2086, 39220), (2120, 38591), (2590, 31588), (2968, 27565), (2980, 27454), (3710, 22052), (3922, 20860), (4172, 19610), (5180, 15794), (5215, 15688), (5513, 14840), (5960, 13727), (7420, 11026), (7844, 10430), (7897, 10360), (8344, 9805)]