21052409

素因数分解:

$7^2\times {\mathrm{17}}^1\times {\mathrm{127}}^1\times {\mathrm{199}}^1$

素因数の和:357

約数の個数: 24

約数和(自身を含む): 26265600

約数和(自身を除く): 5213191

約数列:

[1, 7, 17, 49, 119, 127, 199, 833, 889, 1393, 2159, 3383, 6223, 9751, 15113, 23681, 25273, 105791, 165767, 176911, 429641, 1238377, 3007487, 21052409]

約数ペア:

[(1, 21052409), (7, 3007487), (17, 1238377), (49, 429641), (119, 176911), (127, 165767), (199, 105791), (833, 25273), (889, 23681), (1393, 15113), (2159, 9751), (3383, 6223)]