20878780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{613}}^1$

素因数の和:766

約数の個数: 48

約数和(自身を含む): 47656224

約数和(自身を除く): 26777444

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 131, 260, 262, 524, 613, 655, 1226, 1310, 1703, 2452, 2620, 3065, 3406, 6130, 6812, 7969, 8515, 12260, 15938, 17030, 31876, 34060, 39845, 79690, 80303, 159380, 160606, 321212, 401515, 803030, 1043939, 1606060, 2087878, 4175756, 5219695, 10439390, 20878780]

約数ペア:

[(1, 20878780), (2, 10439390), (4, 5219695), (5, 4175756), (10, 2087878), (13, 1606060), (20, 1043939), (26, 803030), (52, 401515), (65, 321212), (130, 160606), (131, 159380), (260, 80303), (262, 79690), (524, 39845), (613, 34060), (655, 31876), (1226, 17030), (1310, 15938), (1703, 12260), (2452, 8515), (2620, 7969), (3065, 6812), (3406, 6130)]