21081780

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{173}}^1\times {\mathrm{677}}^1$

素因数の和:865

約数の個数: 72

約数和(自身を含む): 64412712

約数和(自身を除く): 43330932

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 173, 180, 346, 519, 677, 692, 865, 1038, 1354, 1557, 1730, 2031, 2076, 2595, 2708, 3114, 3385, 3460, 4062, 5190, 6093, 6228, 6770, 7785, 8124, 10155, 10380, 12186, 13540, 15570, 20310, 24372, 30465, 31140, 40620, 60930, 117121, 121860, 234242, 351363, 468484, 585605, 702726, 1054089, 1171210, 1405452, 1756815, 2108178, 2342420, 3513630, 4216356, 5270445, 7027260, 10540890, 21081780]

約数ペア:

[(1, 21081780), (2, 10540890), (3, 7027260), (4, 5270445), (5, 4216356), (6, 3513630), (9, 2342420), (10, 2108178), (12, 1756815), (15, 1405452), (18, 1171210), (20, 1054089), (30, 702726), (36, 585605), (45, 468484), (60, 351363), (90, 234242), (173, 121860), (180, 117121), (346, 60930), (519, 40620), (677, 31140), (692, 30465), (865, 24372), (1038, 20310), (1354, 15570), (1557, 13540), (1730, 12186), (2031, 10380), (2076, 10155), (2595, 8124), (2708, 7785), (3114, 6770), (3385, 6228), (3460, 6093), (4062, 5190)]