21720405

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{269}}^1\times {\mathrm{769}}^1$

素因数の和:1053

約数の個数: 32

約数和(自身を含む): 39916800

約数和(自身を除く): 18196395

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 269, 769, 807, 1345, 1883, 2307, 3845, 4035, 5383, 5649, 9415, 11535, 16149, 26915, 28245, 80745, 206861, 620583, 1034305, 1448027, 3102915, 4344081, 7240135, 21720405]

約数ペア:

[(1, 21720405), (3, 7240135), (5, 4344081), (7, 3102915), (15, 1448027), (21, 1034305), (35, 620583), (105, 206861), (269, 80745), (769, 28245), (807, 26915), (1345, 16149), (1883, 11535), (2307, 9415), (3845, 5649), (4035, 5383)]