21509785

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{157}}^1$

素因数の和:273

約数の個数: 32

約数和(自身を含む): 29486592

約数和(自身を除く): 7976807

約数列:

[1, 5, 11, 47, 53, 55, 157, 235, 265, 517, 583, 785, 1727, 2491, 2585, 2915, 7379, 8321, 8635, 12455, 27401, 36895, 41605, 81169, 91531, 137005, 391087, 405845, 457655, 1955435, 4301957, 21509785]

約数ペア:

[(1, 21509785), (5, 4301957), (11, 1955435), (47, 457655), (53, 405845), (55, 391087), (157, 137005), (235, 91531), (265, 81169), (517, 41605), (583, 36895), (785, 27401), (1727, 12455), (2491, 8635), (2585, 8321), (2915, 7379)]