21889720

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{127}}^1\times {\mathrm{139}}^1$

素因数の和:308

約数の個数: 64

約数和(自身を含む): 51609600

約数和(自身を除く): 29719880

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 127, 139, 155, 248, 254, 278, 310, 508, 556, 620, 635, 695, 1016, 1112, 1240, 1270, 1390, 2540, 2780, 3937, 4309, 5080, 5560, 7874, 8618, 15748, 17236, 17653, 19685, 21545, 31496, 34472, 35306, 39370, 43090, 70612, 78740, 86180, 88265, 141224, 157480, 172360, 176530, 353060, 547243, 706120, 1094486, 2188972, 2736215, 4377944, 5472430, 10944860, 21889720]

約数ペア:

[(1, 21889720), (2, 10944860), (4, 5472430), (5, 4377944), (8, 2736215), (10, 2188972), (20, 1094486), (31, 706120), (40, 547243), (62, 353060), (124, 176530), (127, 172360), (139, 157480), (155, 141224), (248, 88265), (254, 86180), (278, 78740), (310, 70612), (508, 43090), (556, 39370), (620, 35306), (635, 34472), (695, 31496), (1016, 21545), (1112, 19685), (1240, 17653), (1270, 17236), (1390, 15748), (2540, 8618), (2780, 7874), (3937, 5560), (4309, 5080)]