21157960

素因数分解:

$2^3\times 5^1\times {\mathrm{547}}^1\times {\mathrm{967}}^1$

素因数の和:1525

約数の個数: 32

約数和(自身を含む): 47741760

約数和(自身を除く): 26583800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 547, 967, 1094, 1934, 2188, 2735, 3868, 4376, 4835, 5470, 7736, 9670, 10940, 19340, 21880, 38680, 528949, 1057898, 2115796, 2644745, 4231592, 5289490, 10578980, 21157960]

約数ペア:

[(1, 21157960), (2, 10578980), (4, 5289490), (5, 4231592), (8, 2644745), (10, 2115796), (20, 1057898), (40, 528949), (547, 38680), (967, 21880), (1094, 19340), (1934, 10940), (2188, 9670), (2735, 7736), (3868, 5470), (4376, 4835)]