81759440

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{20857}}^1$

素因数の和:20884

約数の個数: 60

約数和(自身を含む): 221136516

約数和(自身を除く): 139377076

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 20857, 41714, 83428, 104285, 145999, 166856, 208570, 291998, 333712, 417140, 583996, 729995, 834280, 1021993, 1167992, 1459990, 1668560, 2043986, 2335984, 2919980, 4087972, 5109965, 5839960, 8175944, 10219930, 11679920, 16351888, 20439860, 40879720, 81759440]

約数ペア:

[(1, 81759440), (2, 40879720), (4, 20439860), (5, 16351888), (7, 11679920), (8, 10219930), (10, 8175944), (14, 5839960), (16, 5109965), (20, 4087972), (28, 2919980), (35, 2335984), (40, 2043986), (49, 1668560), (56, 1459990), (70, 1167992), (80, 1021993), (98, 834280), (112, 729995), (140, 583996), (196, 417140), (245, 333712), (280, 291998), (392, 208570), (490, 166856), (560, 145999), (784, 104285), (980, 83428), (1960, 41714), (3920, 20857)]