19996720

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{5813}}^1$

素因数の和:5869

約数の個数: 40

約数和(自身を含む): 47581776

約数和(自身を除く): 27585056

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 5813, 11626, 23252, 29065, 46504, 58130, 93008, 116260, 232520, 249959, 465040, 499918, 999836, 1249795, 1999672, 2499590, 3999344, 4999180, 9998360, 19996720]

約数ペア:

[(1, 19996720), (2, 9998360), (4, 4999180), (5, 3999344), (8, 2499590), (10, 1999672), (16, 1249795), (20, 999836), (40, 499918), (43, 465040), (80, 249959), (86, 232520), (172, 116260), (215, 93008), (344, 58130), (430, 46504), (688, 29065), (860, 23252), (1720, 11626), (3440, 5813)]