21591405

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{823}}^1$

素因数の和:898

約数の個数: 48

約数和(自身を含む): 41648256

約数和(自身を除く): 20056851

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 53, 55, 99, 159, 165, 265, 477, 495, 583, 795, 823, 1749, 2385, 2469, 2915, 4115, 5247, 7407, 8745, 9053, 12345, 26235, 27159, 37035, 43619, 45265, 81477, 130857, 135795, 218095, 392571, 407385, 479809, 654285, 1439427, 1962855, 2399045, 4318281, 7197135, 21591405]

約数ペア:

[(1, 21591405), (3, 7197135), (5, 4318281), (9, 2399045), (11, 1962855), (15, 1439427), (33, 654285), (45, 479809), (53, 407385), (55, 392571), (99, 218095), (159, 135795), (165, 130857), (265, 81477), (477, 45265), (495, 43619), (583, 37035), (795, 27159), (823, 26235), (1749, 12345), (2385, 9053), (2469, 8745), (2915, 7407), (4115, 5247)]