21217360

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15601}}^1$

素因数の和:15631

約数の個数: 40

約数和(自身を含む): 52235496

約数和(自身を除く): 31018136

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15601, 31202, 62404, 78005, 124808, 156010, 249616, 265217, 312020, 530434, 624040, 1060868, 1248080, 1326085, 2121736, 2652170, 4243472, 5304340, 10608680, 21217360]

約数ペア:

[(1, 21217360), (2, 10608680), (4, 5304340), (5, 4243472), (8, 2652170), (10, 2121736), (16, 1326085), (17, 1248080), (20, 1060868), (34, 624040), (40, 530434), (68, 312020), (80, 265217), (85, 249616), (136, 156010), (170, 124808), (272, 78005), (340, 62404), (680, 31202), (1360, 15601)]