20781880

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{461}}^1$

素因数の和:509

約数の個数: 96

約数和(自身を含む): 56881440

約数和(自身を除く): 36099560

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 23, 28, 35, 40, 46, 49, 56, 70, 92, 98, 115, 140, 161, 184, 196, 230, 245, 280, 322, 392, 460, 461, 490, 644, 805, 920, 922, 980, 1127, 1288, 1610, 1844, 1960, 2254, 2305, 3220, 3227, 3688, 4508, 4610, 5635, 6440, 6454, 9016, 9220, 10603, 11270, 12908, 16135, 18440, 21206, 22540, 22589, 25816, 32270, 42412, 45080, 45178, 53015, 64540, 74221, 84824, 90356, 106030, 112945, 129080, 148442, 180712, 212060, 225890, 296884, 371105, 424120, 451780, 519547, 593768, 742210, 903560, 1039094, 1484420, 2078188, 2597735, 2968840, 4156376, 5195470, 10390940, 20781880]

約数ペア:

[(1, 20781880), (2, 10390940), (4, 5195470), (5, 4156376), (7, 2968840), (8, 2597735), (10, 2078188), (14, 1484420), (20, 1039094), (23, 903560), (28, 742210), (35, 593768), (40, 519547), (46, 451780), (49, 424120), (56, 371105), (70, 296884), (92, 225890), (98, 212060), (115, 180712), (140, 148442), (161, 129080), (184, 112945), (196, 106030), (230, 90356), (245, 84824), (280, 74221), (322, 64540), (392, 53015), (460, 45178), (461, 45080), (490, 42412), (644, 32270), (805, 25816), (920, 22589), (922, 22540), (980, 21206), (1127, 18440), (1288, 16135), (1610, 12908), (1844, 11270), (1960, 10603), (2254, 9220), (2305, 9016), (3220, 6454), (3227, 6440), (3688, 5635), (4508, 4610)]