19980855

素因数分解:

$3^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{251}}^1$

素因数の和:352

約数の個数: 48

約数和(自身を含む): 36560160

約数和(自身を除く): 16579305

約数列:

[1, 3, 5, 9, 15, 29, 45, 61, 87, 145, 183, 251, 261, 305, 435, 549, 753, 915, 1255, 1305, 1769, 2259, 2745, 3765, 5307, 7279, 8845, 11295, 15311, 15921, 21837, 26535, 36395, 45933, 65511, 76555, 79605, 109185, 137799, 229665, 327555, 444019, 688995, 1332057, 2220095, 3996171, 6660285, 19980855]

約数ペア:

[(1, 19980855), (3, 6660285), (5, 3996171), (9, 2220095), (15, 1332057), (29, 688995), (45, 444019), (61, 327555), (87, 229665), (145, 137799), (183, 109185), (251, 79605), (261, 76555), (305, 65511), (435, 45933), (549, 36395), (753, 26535), (915, 21837), (1255, 15921), (1305, 15311), (1769, 11295), (2259, 8845), (2745, 7279), (3765, 5307)]