21153880

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{131}}^1\times {\mathrm{367}}^1$

素因数の和:520

約数の個数: 64

約数和(自身を含む): 52462080

約数和(自身を除く): 31308200

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 131, 220, 262, 367, 440, 524, 655, 734, 1048, 1310, 1441, 1468, 1835, 2620, 2882, 2936, 3670, 4037, 5240, 5764, 7205, 7340, 8074, 11528, 14410, 14680, 16148, 20185, 28820, 32296, 40370, 48077, 57640, 80740, 96154, 161480, 192308, 240385, 384616, 480770, 528847, 961540, 1057694, 1923080, 2115388, 2644235, 4230776, 5288470, 10576940, 21153880]

約数ペア:

[(1, 21153880), (2, 10576940), (4, 5288470), (5, 4230776), (8, 2644235), (10, 2115388), (11, 1923080), (20, 1057694), (22, 961540), (40, 528847), (44, 480770), (55, 384616), (88, 240385), (110, 192308), (131, 161480), (220, 96154), (262, 80740), (367, 57640), (440, 48077), (524, 40370), (655, 32296), (734, 28820), (1048, 20185), (1310, 16148), (1441, 14680), (1468, 14410), (1835, 11528), (2620, 8074), (2882, 7340), (2936, 7205), (3670, 5764), (4037, 5240)]