21109980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{37}}^2\times {\mathrm{257}}^1$

素因数の和:343

約数の個数: 72

約数和(自身を含む): 60985008

約数和(自身を除く): 39875028

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 37, 60, 74, 111, 148, 185, 222, 257, 370, 444, 514, 555, 740, 771, 1028, 1110, 1285, 1369, 1542, 2220, 2570, 2738, 3084, 3855, 4107, 5140, 5476, 6845, 7710, 8214, 9509, 13690, 15420, 16428, 19018, 20535, 27380, 28527, 38036, 41070, 47545, 57054, 82140, 95090, 114108, 142635, 190180, 285270, 351833, 570540, 703666, 1055499, 1407332, 1759165, 2110998, 3518330, 4221996, 5277495, 7036660, 10554990, 21109980]

約数ペア:

[(1, 21109980), (2, 10554990), (3, 7036660), (4, 5277495), (5, 4221996), (6, 3518330), (10, 2110998), (12, 1759165), (15, 1407332), (20, 1055499), (30, 703666), (37, 570540), (60, 351833), (74, 285270), (111, 190180), (148, 142635), (185, 114108), (222, 95090), (257, 82140), (370, 57054), (444, 47545), (514, 41070), (555, 38036), (740, 28527), (771, 27380), (1028, 20535), (1110, 19018), (1285, 16428), (1369, 15420), (1542, 13690), (2220, 9509), (2570, 8214), (2738, 7710), (3084, 6845), (3855, 5476), (4107, 5140)]