20821515

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{571}}^1$

素因数の和:620

約数の個数: 64

約数和(自身を含む): 41513472

約数和(自身を除く): 20691957

約数列:

[1, 3, 5, 11, 13, 15, 17, 33, 39, 51, 55, 65, 85, 143, 165, 187, 195, 221, 255, 429, 561, 571, 663, 715, 935, 1105, 1713, 2145, 2431, 2805, 2855, 3315, 6281, 7293, 7423, 8565, 9707, 12155, 18843, 22269, 29121, 31405, 36465, 37115, 48535, 81653, 94215, 106777, 111345, 126191, 145605, 244959, 320331, 378573, 408265, 533885, 630955, 1224795, 1388101, 1601655, 1892865, 4164303, 6940505, 20821515]

約数ペア:

[(1, 20821515), (3, 6940505), (5, 4164303), (11, 1892865), (13, 1601655), (15, 1388101), (17, 1224795), (33, 630955), (39, 533885), (51, 408265), (55, 378573), (65, 320331), (85, 244959), (143, 145605), (165, 126191), (187, 111345), (195, 106777), (221, 94215), (255, 81653), (429, 48535), (561, 37115), (571, 36465), (663, 31405), (715, 29121), (935, 22269), (1105, 18843), (1713, 12155), (2145, 9707), (2431, 8565), (2805, 7423), (2855, 7293), (3315, 6281)]