20985376

素因数分解:

$2^5\times {\mathrm{43}}^1\times {\mathrm{101}}^1\times {\mathrm{151}}^1$

素因数の和:305

約数の個数: 48

約数和(自身を含む): 42977088

約数和(自身を除く): 21991712

約数列:

[1, 2, 4, 8, 16, 32, 43, 86, 101, 151, 172, 202, 302, 344, 404, 604, 688, 808, 1208, 1376, 1616, 2416, 3232, 4343, 4832, 6493, 8686, 12986, 15251, 17372, 25972, 30502, 34744, 51944, 61004, 69488, 103888, 122008, 138976, 207776, 244016, 488032, 655793, 1311586, 2623172, 5246344, 10492688, 20985376]

約数ペア:

[(1, 20985376), (2, 10492688), (4, 5246344), (8, 2623172), (16, 1311586), (32, 655793), (43, 488032), (86, 244016), (101, 207776), (151, 138976), (172, 122008), (202, 103888), (302, 69488), (344, 61004), (404, 51944), (604, 34744), (688, 30502), (808, 25972), (1208, 17372), (1376, 15251), (1616, 12986), (2416, 8686), (3232, 6493), (4343, 4832)]