19998704

素因数分解:

$2^4\times {\mathrm{11}}^1\times {\mathrm{199}}^1\times {\mathrm{571}}^1$

素因数の和:789

約数の個数: 40

約数和(自身を含む): 42556800

約数和(自身を除く): 22558096

約数列:

[1, 2, 4, 8, 11, 16, 22, 44, 88, 176, 199, 398, 571, 796, 1142, 1592, 2189, 2284, 3184, 4378, 4568, 6281, 8756, 9136, 12562, 17512, 25124, 35024, 50248, 100496, 113629, 227258, 454516, 909032, 1249919, 1818064, 2499838, 4999676, 9999352, 19998704]

約数ペア:

[(1, 19998704), (2, 9999352), (4, 4999676), (8, 2499838), (11, 1818064), (16, 1249919), (22, 909032), (44, 454516), (88, 227258), (176, 113629), (199, 100496), (398, 50248), (571, 35024), (796, 25124), (1142, 17512), (1592, 12562), (2189, 9136), (2284, 8756), (3184, 6281), (4378, 4568)]