21380520

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25453}}^1$

素因数の和:25474

約数の個数: 64

約数和(自身を含む): 73307520

約数和(自身を除く): 51927000

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25453, 50906, 76359, 101812, 127265, 152718, 178171, 203624, 254530, 305436, 356342, 381795, 509060, 534513, 610872, 712684, 763590, 890855, 1018120, 1069026, 1425368, 1527180, 1781710, 2138052, 2672565, 3054360, 3563420, 4276104, 5345130, 7126840, 10690260, 21380520]

約数ペア:

[(1, 21380520), (2, 10690260), (3, 7126840), (4, 5345130), (5, 4276104), (6, 3563420), (7, 3054360), (8, 2672565), (10, 2138052), (12, 1781710), (14, 1527180), (15, 1425368), (20, 1069026), (21, 1018120), (24, 890855), (28, 763590), (30, 712684), (35, 610872), (40, 534513), (42, 509060), (56, 381795), (60, 356342), (70, 305436), (84, 254530), (105, 203624), (120, 178171), (140, 152718), (168, 127265), (210, 101812), (280, 76359), (420, 50906), (840, 25453)]