21891681

素因数分解:

$3^3\times 7^2\times {\mathrm{16547}}^1$

素因数の和:16570

約数の個数: 24

約数和(自身を含む): 37729440

約数和(自身を除く): 15837759

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 441, 1323, 16547, 49641, 115829, 148923, 347487, 446769, 810803, 1042461, 2432409, 3127383, 7297227, 21891681]

約数ペア:

[(1, 21891681), (3, 7297227), (7, 3127383), (9, 2432409), (21, 1042461), (27, 810803), (49, 446769), (63, 347487), (147, 148923), (189, 115829), (441, 49641), (1323, 16547)]