21351220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1$

素因数の和:161

約数の個数: 96

約数和(自身を含む): 52246656

約数和(自身を除く): 30895436

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 37, 43, 44, 55, 61, 74, 86, 110, 122, 148, 172, 185, 215, 220, 244, 305, 370, 407, 430, 473, 610, 671, 740, 814, 860, 946, 1220, 1342, 1591, 1628, 1892, 2035, 2257, 2365, 2623, 2684, 3182, 3355, 4070, 4514, 4730, 5246, 6364, 6710, 7955, 8140, 9028, 9460, 10492, 11285, 13115, 13420, 15910, 17501, 22570, 24827, 26230, 28853, 31820, 35002, 45140, 49654, 52460, 57706, 70004, 87505, 97051, 99308, 115412, 124135, 144265, 175010, 194102, 248270, 288530, 350020, 388204, 485255, 496540, 577060, 970510, 1067561, 1941020, 2135122, 4270244, 5337805, 10675610, 21351220]

約数ペア:

[(1, 21351220), (2, 10675610), (4, 5337805), (5, 4270244), (10, 2135122), (11, 1941020), (20, 1067561), (22, 970510), (37, 577060), (43, 496540), (44, 485255), (55, 388204), (61, 350020), (74, 288530), (86, 248270), (110, 194102), (122, 175010), (148, 144265), (172, 124135), (185, 115412), (215, 99308), (220, 97051), (244, 87505), (305, 70004), (370, 57706), (407, 52460), (430, 49654), (473, 45140), (610, 35002), (671, 31820), (740, 28853), (814, 26230), (860, 24827), (946, 22570), (1220, 17501), (1342, 15910), (1591, 13420), (1628, 13115), (1892, 11285), (2035, 10492), (2257, 9460), (2365, 9028), (2623, 8140), (2684, 7955), (3182, 6710), (3355, 6364), (4070, 5246), (4514, 4730)]