20321721

素因数分解:

$3^2\times 7^3\times {\mathrm{29}}^1\times {\mathrm{227}}^1$

素因数の和:283

約数の個数: 48

約数和(自身を含む): 35568000

約数和(自身を除く): 15246279

約数列:

[1, 3, 7, 9, 21, 29, 49, 63, 87, 147, 203, 227, 261, 343, 441, 609, 681, 1029, 1421, 1589, 1827, 2043, 3087, 4263, 4767, 6583, 9947, 11123, 12789, 14301, 19749, 29841, 33369, 46081, 59247, 77861, 89523, 100107, 138243, 233583, 322567, 414729, 700749, 967701, 2257969, 2903103, 6773907, 20321721]

約数ペア:

[(1, 20321721), (3, 6773907), (7, 2903103), (9, 2257969), (21, 967701), (29, 700749), (49, 414729), (63, 322567), (87, 233583), (147, 138243), (203, 100107), (227, 89523), (261, 77861), (343, 59247), (441, 46081), (609, 33369), (681, 29841), (1029, 19749), (1421, 14301), (1589, 12789), (1827, 11123), (2043, 9947), (3087, 6583), (4263, 4767)]