21155505

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{107}}^1\times {\mathrm{269}}^1$

素因数の和:398

約数の個数: 48

約数和(自身を含む): 39890880

約数和(自身を除く): 18735375

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 107, 147, 245, 269, 321, 535, 735, 749, 807, 1345, 1605, 1883, 2247, 3745, 4035, 5243, 5649, 9415, 11235, 13181, 15729, 26215, 28245, 28783, 39543, 65905, 78645, 86349, 143915, 197715, 201481, 431745, 604443, 1007405, 1410367, 3022215, 4231101, 7051835, 21155505]

約数ペア:

[(1, 21155505), (3, 7051835), (5, 4231101), (7, 3022215), (15, 1410367), (21, 1007405), (35, 604443), (49, 431745), (105, 201481), (107, 197715), (147, 143915), (245, 86349), (269, 78645), (321, 65905), (535, 39543), (735, 28783), (749, 28245), (807, 26215), (1345, 15729), (1605, 13181), (1883, 11235), (2247, 9415), (3745, 5649), (4035, 5243)]