21321378

素因数分解:

$2^1\times 3^2\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{163}}^1$

素因数の和:240

約数の個数: 72

約数和(自身を含む): 51500592

約数和(自身を除く): 30179214

約数列:

[1, 2, 3, 6, 9, 13, 18, 26, 39, 43, 78, 86, 117, 129, 163, 169, 234, 258, 326, 338, 387, 489, 507, 559, 774, 978, 1014, 1118, 1467, 1521, 1677, 2119, 2934, 3042, 3354, 4238, 5031, 6357, 7009, 7267, 10062, 12714, 14018, 14534, 19071, 21027, 21801, 27547, 38142, 42054, 43602, 55094, 63081, 65403, 82641, 91117, 126162, 130806, 165282, 182234, 247923, 273351, 495846, 546702, 820053, 1184521, 1640106, 2369042, 3553563, 7107126, 10660689, 21321378]

約数ペア:

[(1, 21321378), (2, 10660689), (3, 7107126), (6, 3553563), (9, 2369042), (13, 1640106), (18, 1184521), (26, 820053), (39, 546702), (43, 495846), (78, 273351), (86, 247923), (117, 182234), (129, 165282), (163, 130806), (169, 126162), (234, 91117), (258, 82641), (326, 65403), (338, 63081), (387, 55094), (489, 43602), (507, 42054), (559, 38142), (774, 27547), (978, 21801), (1014, 21027), (1118, 19071), (1467, 14534), (1521, 14018), (1677, 12714), (2119, 10062), (2934, 7267), (3042, 7009), (3354, 6357), (4238, 5031)]