21068240

素因数分解:

$2^4\times 5^1\times {\mathrm{389}}^1\times {\mathrm{677}}^1$

素因数の和:1079

約数の個数: 40

約数和(自身を含む): 49182120

約数和(自身を除く): 28113880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 389, 677, 778, 1354, 1556, 1945, 2708, 3112, 3385, 3890, 5416, 6224, 6770, 7780, 10832, 13540, 15560, 27080, 31120, 54160, 263353, 526706, 1053412, 1316765, 2106824, 2633530, 4213648, 5267060, 10534120, 21068240]

約数ペア:

[(1, 21068240), (2, 10534120), (4, 5267060), (5, 4213648), (8, 2633530), (10, 2106824), (16, 1316765), (20, 1053412), (40, 526706), (80, 263353), (389, 54160), (677, 31120), (778, 27080), (1354, 15560), (1556, 13540), (1945, 10832), (2708, 7780), (3112, 6770), (3385, 6224), (3890, 5416)]