21208972

素因数分解:

$2^2\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{1637}}^1$

素因数の和:1761

約数の個数: 24

約数和(自身を含む): 38525760

約数和(自身を除く): 17316788

約数列:

[1, 2, 4, 41, 79, 82, 158, 164, 316, 1637, 3239, 3274, 6478, 6548, 12956, 67117, 129323, 134234, 258646, 268468, 517292, 5302243, 10604486, 21208972]

約数ペア:

[(1, 21208972), (2, 10604486), (4, 5302243), (41, 517292), (79, 268468), (82, 258646), (158, 134234), (164, 129323), (316, 67117), (1637, 12956), (3239, 6548), (3274, 6478)]