19985840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{401}}^1$

素因数の和:510

約数の個数: 80

約数和(自身を含む): 53835840

約数和(自身を除く): 33850000

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 89, 112, 140, 178, 280, 356, 401, 445, 560, 623, 712, 802, 890, 1246, 1424, 1604, 1780, 2005, 2492, 2807, 3115, 3208, 3560, 4010, 4984, 5614, 6230, 6416, 7120, 8020, 9968, 11228, 12460, 14035, 16040, 22456, 24920, 28070, 32080, 35689, 44912, 49840, 56140, 71378, 112280, 142756, 178445, 224560, 249823, 285512, 356890, 499646, 571024, 713780, 999292, 1249115, 1427560, 1998584, 2498230, 2855120, 3997168, 4996460, 9992920, 19985840]

約数ペア:

[(1, 19985840), (2, 9992920), (4, 4996460), (5, 3997168), (7, 2855120), (8, 2498230), (10, 1998584), (14, 1427560), (16, 1249115), (20, 999292), (28, 713780), (35, 571024), (40, 499646), (56, 356890), (70, 285512), (80, 249823), (89, 224560), (112, 178445), (140, 142756), (178, 112280), (280, 71378), (356, 56140), (401, 49840), (445, 44912), (560, 35689), (623, 32080), (712, 28070), (802, 24920), (890, 22456), (1246, 16040), (1424, 14035), (1604, 12460), (1780, 11228), (2005, 9968), (2492, 8020), (2807, 7120), (3115, 6416), (3208, 6230), (3560, 5614), (4010, 4984)]