20502080

素因数分解:

$2^6\times 5^1\times {\mathrm{79}}^1\times {\mathrm{811}}^1$

素因数の和:907

約数の個数: 56

約数和(自身を含む): 49499520

約数和(自身を除く): 28997440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 79, 80, 158, 160, 316, 320, 395, 632, 790, 811, 1264, 1580, 1622, 2528, 3160, 3244, 4055, 5056, 6320, 6488, 8110, 12640, 12976, 16220, 25280, 25952, 32440, 51904, 64069, 64880, 128138, 129760, 256276, 259520, 320345, 512552, 640690, 1025104, 1281380, 2050208, 2562760, 4100416, 5125520, 10251040, 20502080]

約数ペア:

[(1, 20502080), (2, 10251040), (4, 5125520), (5, 4100416), (8, 2562760), (10, 2050208), (16, 1281380), (20, 1025104), (32, 640690), (40, 512552), (64, 320345), (79, 259520), (80, 256276), (158, 129760), (160, 128138), (316, 64880), (320, 64069), (395, 51904), (632, 32440), (790, 25952), (811, 25280), (1264, 16220), (1580, 12976), (1622, 12640), (2528, 8110), (3160, 6488), (3244, 6320), (4055, 5056)]