21109240

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{839}}^1$

素因数の和:904

約数の個数: 64

約数和(自身を含む): 51710400

約数和(自身を除く): 30601160

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 37, 40, 68, 74, 85, 136, 148, 170, 185, 296, 340, 370, 629, 680, 740, 839, 1258, 1480, 1678, 2516, 3145, 3356, 4195, 5032, 6290, 6712, 8390, 12580, 14263, 16780, 25160, 28526, 31043, 33560, 57052, 62086, 71315, 114104, 124172, 142630, 155215, 248344, 285260, 310430, 527731, 570520, 620860, 1055462, 1241720, 2110924, 2638655, 4221848, 5277310, 10554620, 21109240]

約数ペア:

[(1, 21109240), (2, 10554620), (4, 5277310), (5, 4221848), (8, 2638655), (10, 2110924), (17, 1241720), (20, 1055462), (34, 620860), (37, 570520), (40, 527731), (68, 310430), (74, 285260), (85, 248344), (136, 155215), (148, 142630), (170, 124172), (185, 114104), (296, 71315), (340, 62086), (370, 57052), (629, 33560), (680, 31043), (740, 28526), (839, 25160), (1258, 16780), (1480, 14263), (1678, 12580), (2516, 8390), (3145, 6712), (3356, 6290), (4195, 5032)]