81879980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{6427}}^1$

素因数の和:6463

約数の個数: 72

約数和(自身を含む): 215440848

約数和(自身を除く): 133560868

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 49, 52, 65, 70, 91, 98, 130, 140, 182, 196, 245, 260, 364, 455, 490, 637, 910, 980, 1274, 1820, 2548, 3185, 6370, 6427, 12740, 12854, 25708, 32135, 44989, 64270, 83551, 89978, 128540, 167102, 179956, 224945, 314923, 334204, 417755, 449890, 584857, 629846, 835510, 899780, 1169714, 1259692, 1574615, 1671020, 2339428, 2924285, 3149230, 4093999, 5848570, 6298460, 8187998, 11697140, 16375996, 20469995, 40939990, 81879980]

約数ペア:

[(1, 81879980), (2, 40939990), (4, 20469995), (5, 16375996), (7, 11697140), (10, 8187998), (13, 6298460), (14, 5848570), (20, 4093999), (26, 3149230), (28, 2924285), (35, 2339428), (49, 1671020), (52, 1574615), (65, 1259692), (70, 1169714), (91, 899780), (98, 835510), (130, 629846), (140, 584857), (182, 449890), (196, 417755), (245, 334204), (260, 314923), (364, 224945), (455, 179956), (490, 167102), (637, 128540), (910, 89978), (980, 83551), (1274, 64270), (1820, 44989), (2548, 32135), (3185, 25708), (6370, 12854), (6427, 12740)]