21378978

素因数分解:

$2^1\times 3^4\times {\mathrm{131969}}^1$

素因数の和:131983

約数の個数: 20

約数和(自身を含む): 47905110

約数和(自身を除く): 26526132

約数列:

[1, 2, 3, 6, 9, 18, 27, 54, 81, 162, 131969, 263938, 395907, 791814, 1187721, 2375442, 3563163, 7126326, 10689489, 21378978]

約数ペア:

[(1, 21378978), (2, 10689489), (3, 7126326), (6, 3563163), (9, 2375442), (18, 1187721), (27, 791814), (54, 395907), (81, 263938), (162, 131969)]