21251709

素因数分解:

$3^2\times {\mathrm{19}}^2\times {\mathrm{31}}^1\times {\mathrm{211}}^1$

素因数の和:286

約数の個数: 36

約数和(自身を含む): 33601152

約数和(自身を除く): 12349443

約数列:

[1, 3, 9, 19, 31, 57, 93, 171, 211, 279, 361, 589, 633, 1083, 1767, 1899, 3249, 4009, 5301, 6541, 11191, 12027, 19623, 33573, 36081, 58869, 76171, 100719, 124279, 228513, 372837, 685539, 1118511, 2361301, 7083903, 21251709]

約数ペア:

[(1, 21251709), (3, 7083903), (9, 2361301), (19, 1118511), (31, 685539), (57, 372837), (93, 228513), (171, 124279), (211, 100719), (279, 76171), (361, 58869), (589, 36081), (633, 33573), (1083, 19623), (1767, 12027), (1899, 11191), (3249, 6541), (4009, 5301)]