21978820

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{57839}}^1$

素因数の和:57867

約数の個数: 24

約数和(自身を含む): 48585600

約数和(自身を除く): 26606780

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 380, 57839, 115678, 231356, 289195, 578390, 1098941, 1156780, 2197882, 4395764, 5494705, 10989410, 21978820]

約数ペア:

[(1, 21978820), (2, 10989410), (4, 5494705), (5, 4395764), (10, 2197882), (19, 1156780), (20, 1098941), (38, 578390), (76, 289195), (95, 231356), (190, 115678), (380, 57839)]