21355120

素因数分解:

$2^4\times 5^1\times {\mathrm{173}}^1\times {\mathrm{1543}}^1$

素因数の和:1729

約数の個数: 40

約数和(自身を含む): 49970016

約数和(自身を除く): 28614896

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 173, 346, 692, 865, 1384, 1543, 1730, 2768, 3086, 3460, 6172, 6920, 7715, 12344, 13840, 15430, 24688, 30860, 61720, 123440, 266939, 533878, 1067756, 1334695, 2135512, 2669390, 4271024, 5338780, 10677560, 21355120]

約数ペア:

[(1, 21355120), (2, 10677560), (4, 5338780), (5, 4271024), (8, 2669390), (10, 2135512), (16, 1334695), (20, 1067756), (40, 533878), (80, 266939), (173, 123440), (346, 61720), (692, 30860), (865, 24688), (1384, 15430), (1543, 13840), (1730, 12344), (2768, 7715), (3086, 6920), (3460, 6172)]