21721978

素因数分解:

$2^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{9371}}^1$

素因数の和:9453

約数の個数: 16

約数和(自身を含む): 34863840

約数和(自身を除く): 13141862

約数列:

[1, 2, 19, 38, 61, 122, 1159, 2318, 9371, 18742, 178049, 356098, 571631, 1143262, 10860989, 21721978]

約数ペア:

[(1, 21721978), (2, 10860989), (19, 1143262), (38, 571631), (61, 356098), (122, 178049), (1159, 18742), (2318, 9371)]