20001080

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{131}}^1\times {\mathrm{347}}^1$

素因数の和:500

約数の個数: 64

約数和(自身を含む): 49610880

約数和(自身を除く): 29609800

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 131, 220, 262, 347, 440, 524, 655, 694, 1048, 1310, 1388, 1441, 1735, 2620, 2776, 2882, 3470, 3817, 5240, 5764, 6940, 7205, 7634, 11528, 13880, 14410, 15268, 19085, 28820, 30536, 38170, 45457, 57640, 76340, 90914, 152680, 181828, 227285, 363656, 454570, 500027, 909140, 1000054, 1818280, 2000108, 2500135, 4000216, 5000270, 10000540, 20001080]

約数ペア:

[(1, 20001080), (2, 10000540), (4, 5000270), (5, 4000216), (8, 2500135), (10, 2000108), (11, 1818280), (20, 1000054), (22, 909140), (40, 500027), (44, 454570), (55, 363656), (88, 227285), (110, 181828), (131, 152680), (220, 90914), (262, 76340), (347, 57640), (440, 45457), (524, 38170), (655, 30536), (694, 28820), (1048, 19085), (1310, 15268), (1388, 14410), (1441, 13880), (1735, 11528), (2620, 7634), (2776, 7205), (2882, 6940), (3470, 5764), (3817, 5240)]