21310263

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{557}}^1$

素因数の和:688

約数の個数: 32

約数和(自身を含む): 34372800

約数和(自身を除く): 13062537

約数列:

[1, 3, 9, 13, 27, 39, 109, 117, 327, 351, 557, 981, 1417, 1671, 2943, 4251, 5013, 7241, 12753, 15039, 21723, 38259, 60713, 65169, 182139, 195507, 546417, 789269, 1639251, 2367807, 7103421, 21310263]

約数ペア:

[(1, 21310263), (3, 7103421), (9, 2367807), (13, 1639251), (27, 789269), (39, 546417), (109, 195507), (117, 182139), (327, 65169), (351, 60713), (557, 38259), (981, 21723), (1417, 15039), (1671, 12753), (2943, 7241), (4251, 5013)]