81985280

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^2\times {\mathrm{379}}^1$

素因数の和:426

約数の個数: 108

約数和(自身を含む): 213209640

約数和(自身を除く): 131224360

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 169, 208, 256, 260, 320, 338, 379, 416, 520, 640, 676, 758, 832, 845, 1040, 1280, 1352, 1516, 1664, 1690, 1895, 2080, 2704, 3032, 3328, 3380, 3790, 4160, 4927, 5408, 6064, 6760, 7580, 8320, 9854, 10816, 12128, 13520, 15160, 16640, 19708, 21632, 24256, 24635, 27040, 30320, 39416, 43264, 48512, 49270, 54080, 60640, 64051, 78832, 97024, 98540, 108160, 121280, 128102, 157664, 197080, 216320, 242560, 256204, 315328, 320255, 394160, 485120, 512408, 630656, 640510, 788320, 1024816, 1261312, 1281020, 1576640, 2049632, 2562040, 3153280, 4099264, 5124080, 6306560, 8198528, 10248160, 16397056, 20496320, 40992640, 81985280]

約数ペア:

[(1, 81985280), (2, 40992640), (4, 20496320), (5, 16397056), (8, 10248160), (10, 8198528), (13, 6306560), (16, 5124080), (20, 4099264), (26, 3153280), (32, 2562040), (40, 2049632), (52, 1576640), (64, 1281020), (65, 1261312), (80, 1024816), (104, 788320), (128, 640510), (130, 630656), (160, 512408), (169, 485120), (208, 394160), (256, 320255), (260, 315328), (320, 256204), (338, 242560), (379, 216320), (416, 197080), (520, 157664), (640, 128102), (676, 121280), (758, 108160), (832, 98540), (845, 97024), (1040, 78832), (1280, 64051), (1352, 60640), (1516, 54080), (1664, 49270), (1690, 48512), (1895, 43264), (2080, 39416), (2704, 30320), (3032, 27040), (3328, 24635), (3380, 24256), (3790, 21632), (4160, 19708), (4927, 16640), (5408, 15160), (6064, 13520), (6760, 12128), (7580, 10816), (8320, 9854)]