20681440

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{163}}^1$

素因数の和:252

約数の個数: 96

約数和(自身を含む): 53809056

約数和(自身を除く): 33127616

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 61, 65, 80, 104, 122, 130, 160, 163, 208, 244, 260, 305, 326, 416, 488, 520, 610, 652, 793, 815, 976, 1040, 1220, 1304, 1586, 1630, 1952, 2080, 2119, 2440, 2608, 3172, 3260, 3965, 4238, 4880, 5216, 6344, 6520, 7930, 8476, 9760, 9943, 10595, 12688, 13040, 15860, 16952, 19886, 21190, 25376, 26080, 31720, 33904, 39772, 42380, 49715, 63440, 67808, 79544, 84760, 99430, 126880, 129259, 159088, 169520, 198860, 258518, 318176, 339040, 397720, 517036, 646295, 795440, 1034072, 1292590, 1590880, 2068144, 2585180, 4136288, 5170360, 10340720, 20681440]

約数ペア:

[(1, 20681440), (2, 10340720), (4, 5170360), (5, 4136288), (8, 2585180), (10, 2068144), (13, 1590880), (16, 1292590), (20, 1034072), (26, 795440), (32, 646295), (40, 517036), (52, 397720), (61, 339040), (65, 318176), (80, 258518), (104, 198860), (122, 169520), (130, 159088), (160, 129259), (163, 126880), (208, 99430), (244, 84760), (260, 79544), (305, 67808), (326, 63440), (416, 49715), (488, 42380), (520, 39772), (610, 33904), (652, 31720), (793, 26080), (815, 25376), (976, 21190), (1040, 19886), (1220, 16952), (1304, 15860), (1586, 13040), (1630, 12688), (1952, 10595), (2080, 9943), (2119, 9760), (2440, 8476), (2608, 7930), (3172, 6520), (3260, 6344), (3965, 5216), (4238, 4880)]