21391580

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{3251}}^1$

素因数の和:3314

約数の個数: 48

約数和(自身を含む): 52448256

約数和(自身を除く): 31056676

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 70, 94, 140, 188, 235, 329, 470, 658, 940, 1316, 1645, 3251, 3290, 6502, 6580, 13004, 16255, 22757, 32510, 45514, 65020, 91028, 113785, 152797, 227570, 305594, 455140, 611188, 763985, 1069579, 1527970, 2139158, 3055940, 4278316, 5347895, 10695790, 21391580]

約数ペア:

[(1, 21391580), (2, 10695790), (4, 5347895), (5, 4278316), (7, 3055940), (10, 2139158), (14, 1527970), (20, 1069579), (28, 763985), (35, 611188), (47, 455140), (70, 305594), (94, 227570), (140, 152797), (188, 113785), (235, 91028), (329, 65020), (470, 45514), (658, 32510), (940, 22757), (1316, 16255), (1645, 13004), (3251, 6580), (3290, 6502)]