20638720

素因数分解:

$2^{10}\times 5^1\times {\mathrm{29}}^1\times {\mathrm{139}}^1$

素因数の和:193

約数の個数: 88

約数和(自身を含む): 51584400

約数和(自身を除く): 30945680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 29, 32, 40, 58, 64, 80, 116, 128, 139, 145, 160, 232, 256, 278, 290, 320, 464, 512, 556, 580, 640, 695, 928, 1024, 1112, 1160, 1280, 1390, 1856, 2224, 2320, 2560, 2780, 3712, 4031, 4448, 4640, 5120, 5560, 7424, 8062, 8896, 9280, 11120, 14848, 16124, 17792, 18560, 20155, 22240, 29696, 32248, 35584, 37120, 40310, 44480, 64496, 71168, 74240, 80620, 88960, 128992, 142336, 148480, 161240, 177920, 257984, 322480, 355840, 515968, 644960, 711680, 1031936, 1289920, 2063872, 2579840, 4127744, 5159680, 10319360, 20638720]

約数ペア:

[(1, 20638720), (2, 10319360), (4, 5159680), (5, 4127744), (8, 2579840), (10, 2063872), (16, 1289920), (20, 1031936), (29, 711680), (32, 644960), (40, 515968), (58, 355840), (64, 322480), (80, 257984), (116, 177920), (128, 161240), (139, 148480), (145, 142336), (160, 128992), (232, 88960), (256, 80620), (278, 74240), (290, 71168), (320, 64496), (464, 44480), (512, 40310), (556, 37120), (580, 35584), (640, 32248), (695, 29696), (928, 22240), (1024, 20155), (1112, 18560), (1160, 17792), (1280, 16124), (1390, 14848), (1856, 11120), (2224, 9280), (2320, 8896), (2560, 8062), (2780, 7424), (3712, 5560), (4031, 5120), (4448, 4640)]