20400640

素因数分解:

$2^9\times 5^1\times {\mathrm{13}}^1\times {\mathrm{613}}^1$

素因数の和:649

約数の個数: 80

約数和(自身を含む): 52762248

約数和(自身を除く): 32361608

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, 613, 640, 832, 1040, 1226, 1280, 1664, 2080, 2452, 2560, 3065, 3328, 4160, 4904, 6130, 6656, 7969, 8320, 9808, 12260, 15938, 16640, 19616, 24520, 31876, 33280, 39232, 39845, 49040, 63752, 78464, 79690, 98080, 127504, 156928, 159380, 196160, 255008, 313856, 318760, 392320, 510016, 637520, 784640, 1020032, 1275040, 1569280, 2040064, 2550080, 4080128, 5100160, 10200320, 20400640]

約数ペア:

[(1, 20400640), (2, 10200320), (4, 5100160), (5, 4080128), (8, 2550080), (10, 2040064), (13, 1569280), (16, 1275040), (20, 1020032), (26, 784640), (32, 637520), (40, 510016), (52, 392320), (64, 318760), (65, 313856), (80, 255008), (104, 196160), (128, 159380), (130, 156928), (160, 127504), (208, 98080), (256, 79690), (260, 78464), (320, 63752), (416, 49040), (512, 39845), (520, 39232), (613, 33280), (640, 31876), (832, 24520), (1040, 19616), (1226, 16640), (1280, 15938), (1664, 12260), (2080, 9808), (2452, 8320), (2560, 7969), (3065, 6656), (3328, 6130), (4160, 4904)]