20615920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{461}}^1$

素因数の和:530

約数の個数: 80

約数和(自身を含む): 52934112

約数和(自身を除く): 32318192

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 43, 52, 65, 80, 86, 104, 130, 172, 208, 215, 260, 344, 430, 461, 520, 559, 688, 860, 922, 1040, 1118, 1720, 1844, 2236, 2305, 2795, 3440, 3688, 4472, 4610, 5590, 5993, 7376, 8944, 9220, 11180, 11986, 18440, 19823, 22360, 23972, 29965, 36880, 39646, 44720, 47944, 59930, 79292, 95888, 99115, 119860, 158584, 198230, 239720, 257699, 317168, 396460, 479440, 515398, 792920, 1030796, 1288495, 1585840, 2061592, 2576990, 4123184, 5153980, 10307960, 20615920]

約数ペア:

[(1, 20615920), (2, 10307960), (4, 5153980), (5, 4123184), (8, 2576990), (10, 2061592), (13, 1585840), (16, 1288495), (20, 1030796), (26, 792920), (40, 515398), (43, 479440), (52, 396460), (65, 317168), (80, 257699), (86, 239720), (104, 198230), (130, 158584), (172, 119860), (208, 99115), (215, 95888), (260, 79292), (344, 59930), (430, 47944), (461, 44720), (520, 39646), (559, 36880), (688, 29965), (860, 23972), (922, 22360), (1040, 19823), (1118, 18440), (1720, 11986), (1844, 11180), (2236, 9220), (2305, 8944), (2795, 7376), (3440, 5993), (3688, 5590), (4472, 4610)]