20998315

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{613}}^1$

素因数の和:679

約数の個数: 32

約数和(自身を含む): 29707776

約数和(自身を除く): 8709461

約数列:

[1, 5, 13, 17, 31, 65, 85, 155, 221, 403, 527, 613, 1105, 2015, 2635, 3065, 6851, 7969, 10421, 19003, 34255, 39845, 52105, 95015, 135473, 247039, 323051, 677365, 1235195, 1615255, 4199663, 20998315]

約数ペア:

[(1, 20998315), (5, 4199663), (13, 1615255), (17, 1235195), (31, 677365), (65, 323051), (85, 247039), (155, 135473), (221, 95015), (403, 52105), (527, 39845), (613, 34255), (1105, 19003), (2015, 10421), (2635, 7969), (3065, 6851)]