21009105

素因数分解:

$3^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{11971}}^1$

素因数の和:11998

約数の個数: 32

約数和(自身を含む): 40225920

約数和(自身を除く): 19216815

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 65, 117, 135, 195, 351, 585, 1755, 11971, 35913, 59855, 107739, 155623, 179565, 323217, 466869, 538695, 778115, 1400607, 1616085, 2334345, 4201821, 7003035, 21009105]

約数ペア:

[(1, 21009105), (3, 7003035), (5, 4201821), (9, 2334345), (13, 1616085), (15, 1400607), (27, 778115), (39, 538695), (45, 466869), (65, 323217), (117, 179565), (135, 155623), (195, 107739), (351, 59855), (585, 35913), (1755, 11971)]