21155355

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{29}}^2\times {\mathrm{43}}^1$

素因数の和:125

約数の個数: 72

約数和(自身を含む): 41849808

約数和(自身を除く): 20694453

約数列:

[1, 3, 5, 9, 13, 15, 29, 39, 43, 45, 65, 87, 117, 129, 145, 195, 215, 261, 377, 387, 435, 559, 585, 645, 841, 1131, 1247, 1305, 1677, 1885, 1935, 2523, 2795, 3393, 3741, 4205, 5031, 5655, 6235, 7569, 8385, 10933, 11223, 12615, 16211, 16965, 18705, 25155, 32799, 36163, 37845, 48633, 54665, 56115, 81055, 98397, 108489, 145899, 163995, 180815, 243165, 325467, 470119, 491985, 542445, 729495, 1410357, 1627335, 2350595, 4231071, 7051785, 21155355]

約数ペア:

[(1, 21155355), (3, 7051785), (5, 4231071), (9, 2350595), (13, 1627335), (15, 1410357), (29, 729495), (39, 542445), (43, 491985), (45, 470119), (65, 325467), (87, 243165), (117, 180815), (129, 163995), (145, 145899), (195, 108489), (215, 98397), (261, 81055), (377, 56115), (387, 54665), (435, 48633), (559, 37845), (585, 36163), (645, 32799), (841, 25155), (1131, 18705), (1247, 16965), (1305, 16211), (1677, 12615), (1885, 11223), (1935, 10933), (2523, 8385), (2795, 7569), (3393, 6235), (3741, 5655), (4205, 5031)]