21307520

素因数分解:

$2^7\times 5^1\times {\mathrm{13}}^2\times {\mathrm{197}}^1$

素因数の和:242

約数の個数: 96

約数和(自身を含む): 55438020

約数和(自身を除く): 34130500

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 169, 197, 208, 260, 320, 338, 394, 416, 520, 640, 676, 788, 832, 845, 985, 1040, 1352, 1576, 1664, 1690, 1970, 2080, 2561, 2704, 3152, 3380, 3940, 4160, 5122, 5408, 6304, 6760, 7880, 8320, 10244, 10816, 12608, 12805, 13520, 15760, 20488, 21632, 25216, 25610, 27040, 31520, 33293, 40976, 51220, 54080, 63040, 66586, 81952, 102440, 108160, 126080, 133172, 163904, 166465, 204880, 266344, 327808, 332930, 409760, 532688, 665860, 819520, 1065376, 1331720, 1639040, 2130752, 2663440, 4261504, 5326880, 10653760, 21307520]

約数ペア:

[(1, 21307520), (2, 10653760), (4, 5326880), (5, 4261504), (8, 2663440), (10, 2130752), (13, 1639040), (16, 1331720), (20, 1065376), (26, 819520), (32, 665860), (40, 532688), (52, 409760), (64, 332930), (65, 327808), (80, 266344), (104, 204880), (128, 166465), (130, 163904), (160, 133172), (169, 126080), (197, 108160), (208, 102440), (260, 81952), (320, 66586), (338, 63040), (394, 54080), (416, 51220), (520, 40976), (640, 33293), (676, 31520), (788, 27040), (832, 25610), (845, 25216), (985, 21632), (1040, 20488), (1352, 15760), (1576, 13520), (1664, 12805), (1690, 12608), (1970, 10816), (2080, 10244), (2561, 8320), (2704, 7880), (3152, 6760), (3380, 6304), (3940, 5408), (4160, 5122)]