19991345

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1\times {\mathrm{107}}^1$

素因数の和:245

約数の個数: 32

約数和(自身を含む): 27371520

約数和(自身を除く): 7380175

約数列:

[1, 5, 11, 43, 55, 79, 107, 215, 395, 473, 535, 869, 1177, 2365, 3397, 4345, 4601, 5885, 8453, 16985, 23005, 37367, 42265, 50611, 92983, 186835, 253055, 363479, 464915, 1817395, 3998269, 19991345]

約数ペア:

[(1, 19991345), (5, 3998269), (11, 1817395), (43, 464915), (55, 363479), (79, 253055), (107, 186835), (215, 92983), (395, 50611), (473, 42265), (535, 37367), (869, 23005), (1177, 16985), (2365, 8453), (3397, 5885), (4345, 4601)]