21409017

素因数分解:

$3^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{109}}^1\times {\mathrm{199}}^1$

素因数の和:365

約数の個数: 32

約数和(自身を含む): 33792000

約数和(自身を除く): 12382983

約数列:

[1, 3, 7, 21, 47, 109, 141, 199, 327, 329, 597, 763, 987, 1393, 2289, 4179, 5123, 9353, 15369, 21691, 28059, 35861, 65073, 65471, 107583, 151837, 196413, 455511, 1019477, 3058431, 7136339, 21409017]

約数ペア:

[(1, 21409017), (3, 7136339), (7, 3058431), (21, 1019477), (47, 455511), (109, 196413), (141, 151837), (199, 107583), (327, 65471), (329, 65073), (597, 35861), (763, 28059), (987, 21691), (1393, 15369), (2289, 9353), (4179, 5123)]