21402820

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{607}}^1$

素因数の和:700

約数の個数: 48

約数和(自身を含む): 47190528

約数和(自身を除く): 25787708

約数列:

[1, 2, 4, 5, 10, 20, 41, 43, 82, 86, 164, 172, 205, 215, 410, 430, 607, 820, 860, 1214, 1763, 2428, 3035, 3526, 6070, 7052, 8815, 12140, 17630, 24887, 26101, 35260, 49774, 52202, 99548, 104404, 124435, 130505, 248870, 261010, 497740, 522020, 1070141, 2140282, 4280564, 5350705, 10701410, 21402820]

約数ペア:

[(1, 21402820), (2, 10701410), (4, 5350705), (5, 4280564), (10, 2140282), (20, 1070141), (41, 522020), (43, 497740), (82, 261010), (86, 248870), (164, 130505), (172, 124435), (205, 104404), (215, 99548), (410, 52202), (430, 49774), (607, 35260), (820, 26101), (860, 24887), (1214, 17630), (1763, 12140), (2428, 8815), (3035, 7052), (3526, 6070)]