20808921

素因数分解:

$3^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{727}}^1$

素因数の和:813

約数の個数: 32

約数和(自身を含む): 33546240

約数和(自身を除く): 12737319

約数列:

[1, 3, 7, 21, 29, 47, 87, 141, 203, 329, 609, 727, 987, 1363, 2181, 4089, 5089, 9541, 15267, 21083, 28623, 34169, 63249, 102507, 147581, 239183, 442743, 717549, 990901, 2972703, 6936307, 20808921]

約数ペア:

[(1, 20808921), (3, 6936307), (7, 2972703), (21, 990901), (29, 717549), (47, 442743), (87, 239183), (141, 147581), (203, 102507), (329, 63249), (609, 34169), (727, 28623), (987, 21083), (1363, 15267), (2181, 9541), (4089, 5089)]