21408765

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{4973}}^1$

素因数の和:5029

約数の個数: 32

約数和(自身を含む): 40110336

約数和(自身を除く): 18701571

約数列:

[1, 3, 5, 7, 15, 21, 35, 41, 105, 123, 205, 287, 615, 861, 1435, 4305, 4973, 14919, 24865, 34811, 74595, 104433, 174055, 203893, 522165, 611679, 1019465, 1427251, 3058395, 4281753, 7136255, 21408765]

約数ペア:

[(1, 21408765), (3, 7136255), (5, 4281753), (7, 3058395), (15, 1427251), (21, 1019465), (35, 611679), (41, 522165), (105, 203893), (123, 174055), (205, 104433), (287, 74595), (615, 34811), (861, 24865), (1435, 14919), (4305, 4973)]