20421808

素因数分解:

$2^4\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{197}}^1$

素因数の和:266

約数の個数: 80

約数和(自身を含む): 47139840

約数和(自身を除く): 26718032

約数列:

[1, 2, 4, 8, 11, 16, 19, 22, 31, 38, 44, 62, 76, 88, 124, 152, 176, 197, 209, 248, 304, 341, 394, 418, 496, 589, 682, 788, 836, 1178, 1364, 1576, 1672, 2167, 2356, 2728, 3152, 3344, 3743, 4334, 4712, 5456, 6107, 6479, 7486, 8668, 9424, 12214, 12958, 14972, 17336, 24428, 25916, 29944, 34672, 41173, 48856, 51832, 59888, 67177, 82346, 97712, 103664, 116033, 134354, 164692, 232066, 268708, 329384, 464132, 537416, 658768, 928264, 1074832, 1276363, 1856528, 2552726, 5105452, 10210904, 20421808]

約数ペア:

[(1, 20421808), (2, 10210904), (4, 5105452), (8, 2552726), (11, 1856528), (16, 1276363), (19, 1074832), (22, 928264), (31, 658768), (38, 537416), (44, 464132), (62, 329384), (76, 268708), (88, 232066), (124, 164692), (152, 134354), (176, 116033), (197, 103664), (209, 97712), (248, 82346), (304, 67177), (341, 59888), (394, 51832), (418, 48856), (496, 41173), (589, 34672), (682, 29944), (788, 25916), (836, 24428), (1178, 17336), (1364, 14972), (1576, 12958), (1672, 12214), (2167, 9424), (2356, 8668), (2728, 7486), (3152, 6479), (3344, 6107), (3743, 5456), (4334, 4712)]