21440205

素因数分解:

$3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{79}}^1\times {\mathrm{163}}^1$

素因数の和:290

約数の個数: 48

約数和(自身を含む): 38887680

約数和(自身を除く): 17447475

約数列:

[1, 3, 5, 9, 15, 37, 45, 79, 111, 163, 185, 237, 333, 395, 489, 555, 711, 815, 1185, 1467, 1665, 2445, 2923, 3555, 6031, 7335, 8769, 12877, 14615, 18093, 26307, 30155, 38631, 43845, 54279, 64385, 90465, 115893, 131535, 193155, 271395, 476449, 579465, 1429347, 2382245, 4288041, 7146735, 21440205]

約数ペア:

[(1, 21440205), (3, 7146735), (5, 4288041), (9, 2382245), (15, 1429347), (37, 579465), (45, 476449), (79, 271395), (111, 193155), (163, 131535), (185, 115893), (237, 90465), (333, 64385), (395, 54279), (489, 43845), (555, 38631), (711, 30155), (815, 26307), (1185, 18093), (1467, 14615), (1665, 12877), (2445, 8769), (2923, 7335), (3555, 6031)]