20817520

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15307}}^1$

素因数の和:15337

約数の個数: 40

約数和(自身を含む): 51251184

約数和(自身を除く): 30433664

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15307, 30614, 61228, 76535, 122456, 153070, 244912, 260219, 306140, 520438, 612280, 1040876, 1224560, 1301095, 2081752, 2602190, 4163504, 5204380, 10408760, 20817520]

約数ペア:

[(1, 20817520), (2, 10408760), (4, 5204380), (5, 4163504), (8, 2602190), (10, 2081752), (16, 1301095), (17, 1224560), (20, 1040876), (34, 612280), (40, 520438), (68, 306140), (80, 260219), (85, 244912), (136, 153070), (170, 122456), (272, 76535), (340, 61228), (680, 30614), (1360, 15307)]