21458920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{173}}^1\times {\mathrm{443}}^1$

素因数の和:634

約数の個数: 64

約数和(自身を含む): 55624320

約数和(自身を除く): 34165400

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 173, 280, 346, 443, 692, 865, 886, 1211, 1384, 1730, 1772, 2215, 2422, 3101, 3460, 3544, 4430, 4844, 6055, 6202, 6920, 8860, 9688, 12110, 12404, 15505, 17720, 24220, 24808, 31010, 48440, 62020, 76639, 124040, 153278, 306556, 383195, 536473, 613112, 766390, 1072946, 1532780, 2145892, 2682365, 3065560, 4291784, 5364730, 10729460, 21458920]

約数ペア:

[(1, 21458920), (2, 10729460), (4, 5364730), (5, 4291784), (7, 3065560), (8, 2682365), (10, 2145892), (14, 1532780), (20, 1072946), (28, 766390), (35, 613112), (40, 536473), (56, 383195), (70, 306556), (140, 153278), (173, 124040), (280, 76639), (346, 62020), (443, 48440), (692, 31010), (865, 24808), (886, 24220), (1211, 17720), (1384, 15505), (1730, 12404), (1772, 12110), (2215, 9688), (2422, 8860), (3101, 6920), (3460, 6202), (3544, 6055), (4430, 4844)]