21378344

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{349}}^1$

素因数の和:418

約数の個数: 64

約数和(自身を含む): 47040000

約数和(自身を除く): 25661656

約数列:

[1, 2, 4, 8, 13, 19, 26, 31, 38, 52, 62, 76, 104, 124, 152, 247, 248, 349, 403, 494, 589, 698, 806, 988, 1178, 1396, 1612, 1976, 2356, 2792, 3224, 4537, 4712, 6631, 7657, 9074, 10819, 13262, 15314, 18148, 21638, 26524, 30628, 36296, 43276, 53048, 61256, 86203, 86552, 140647, 172406, 205561, 281294, 344812, 411122, 562588, 689624, 822244, 1125176, 1644488, 2672293, 5344586, 10689172, 21378344]

約数ペア:

[(1, 21378344), (2, 10689172), (4, 5344586), (8, 2672293), (13, 1644488), (19, 1125176), (26, 822244), (31, 689624), (38, 562588), (52, 411122), (62, 344812), (76, 281294), (104, 205561), (124, 172406), (152, 140647), (247, 86552), (248, 86203), (349, 61256), (403, 53048), (494, 43276), (589, 36296), (698, 30628), (806, 26524), (988, 21638), (1178, 18148), (1396, 15314), (1612, 13262), (1976, 10819), (2356, 9074), (2792, 7657), (3224, 6631), (4537, 4712)]