21603640

素因数分解:

$2^3\times 5^1\times {\mathrm{419}}^1\times {\mathrm{1289}}^1$

素因数の和:1719

約数の個数: 32

約数和(自身を含む): 48762000

約数和(自身を除く): 27158360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 419, 838, 1289, 1676, 2095, 2578, 3352, 4190, 5156, 6445, 8380, 10312, 12890, 16760, 25780, 51560, 540091, 1080182, 2160364, 2700455, 4320728, 5400910, 10801820, 21603640]

約数ペア:

[(1, 21603640), (2, 10801820), (4, 5400910), (5, 4320728), (8, 2700455), (10, 2160364), (20, 1080182), (40, 540091), (419, 51560), (838, 25780), (1289, 16760), (1676, 12890), (2095, 10312), (2578, 8380), (3352, 6445), (4190, 5156)]