20001280

素因数分解:

$2^9\times 5^1\times {\mathrm{13}}^1\times {\mathrm{601}}^1$

素因数の和:637

約数の個数: 80

約数和(自身を含む): 51731064

約数和(自身を除く): 31729784

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 512, 520, 601, 640, 832, 1040, 1202, 1280, 1664, 2080, 2404, 2560, 3005, 3328, 4160, 4808, 6010, 6656, 7813, 8320, 9616, 12020, 15626, 16640, 19232, 24040, 31252, 33280, 38464, 39065, 48080, 62504, 76928, 78130, 96160, 125008, 153856, 156260, 192320, 250016, 307712, 312520, 384640, 500032, 625040, 769280, 1000064, 1250080, 1538560, 2000128, 2500160, 4000256, 5000320, 10000640, 20001280]

約数ペア:

[(1, 20001280), (2, 10000640), (4, 5000320), (5, 4000256), (8, 2500160), (10, 2000128), (13, 1538560), (16, 1250080), (20, 1000064), (26, 769280), (32, 625040), (40, 500032), (52, 384640), (64, 312520), (65, 307712), (80, 250016), (104, 192320), (128, 156260), (130, 153856), (160, 125008), (208, 96160), (256, 78130), (260, 76928), (320, 62504), (416, 48080), (512, 39065), (520, 38464), (601, 33280), (640, 31252), (832, 24040), (1040, 19232), (1202, 16640), (1280, 15626), (1664, 12020), (2080, 9616), (2404, 8320), (2560, 7813), (3005, 6656), (3328, 6010), (4160, 4808)]