21456520

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{53}}^1\times {\mathrm{349}}^1$

素因数の和:442

約数の個数: 64

約数和(自身を含む): 51030000

約数和(自身を除く): 29573480

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 53, 58, 106, 116, 145, 212, 232, 265, 290, 349, 424, 530, 580, 698, 1060, 1160, 1396, 1537, 1745, 2120, 2792, 3074, 3490, 6148, 6980, 7685, 10121, 12296, 13960, 15370, 18497, 20242, 30740, 36994, 40484, 50605, 61480, 73988, 80968, 92485, 101210, 147976, 184970, 202420, 369940, 404840, 536413, 739880, 1072826, 2145652, 2682065, 4291304, 5364130, 10728260, 21456520]

約数ペア:

[(1, 21456520), (2, 10728260), (4, 5364130), (5, 4291304), (8, 2682065), (10, 2145652), (20, 1072826), (29, 739880), (40, 536413), (53, 404840), (58, 369940), (106, 202420), (116, 184970), (145, 147976), (212, 101210), (232, 92485), (265, 80968), (290, 73988), (349, 61480), (424, 50605), (530, 40484), (580, 36994), (698, 30740), (1060, 20242), (1160, 18497), (1396, 15370), (1537, 13960), (1745, 12296), (2120, 10121), (2792, 7685), (3074, 6980), (3490, 6148)]