19981720

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{45413}}^1$

素因数の和:45435

約数の個数: 32

約数和(自身を含む): 49047120

約数和(自身を除く): 29065400

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 220, 440, 45413, 90826, 181652, 227065, 363304, 454130, 499543, 908260, 999086, 1816520, 1998172, 2497715, 3996344, 4995430, 9990860, 19981720]

約数ペア:

[(1, 19981720), (2, 9990860), (4, 4995430), (5, 3996344), (8, 2497715), (10, 1998172), (11, 1816520), (20, 999086), (22, 908260), (40, 499543), (44, 454130), (55, 363304), (88, 227065), (110, 181652), (220, 90826), (440, 45413)]