20804720

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8389}}^1$

素因数の和:8433

約数の個数: 40

約数和(自身を含む): 49937280

約数和(自身を除く): 29132560

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8389, 16778, 33556, 41945, 67112, 83890, 134224, 167780, 260059, 335560, 520118, 671120, 1040236, 1300295, 2080472, 2600590, 4160944, 5201180, 10402360, 20804720]

約数ペア:

[(1, 20804720), (2, 10402360), (4, 5201180), (5, 4160944), (8, 2600590), (10, 2080472), (16, 1300295), (20, 1040236), (31, 671120), (40, 520118), (62, 335560), (80, 260059), (124, 167780), (155, 134224), (248, 83890), (310, 67112), (496, 41945), (620, 33556), (1240, 16778), (2480, 8389)]