20996560

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1553}}^1$

素因数の和:1592

約数の個数: 60

約数和(自身を含む): 52895052

約数和(自身を除く): 31898492

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1553, 1690, 2704, 3106, 3380, 6212, 6760, 7765, 12424, 13520, 15530, 20189, 24848, 31060, 40378, 62120, 80756, 100945, 124240, 161512, 201890, 262457, 323024, 403780, 524914, 807560, 1049828, 1312285, 1615120, 2099656, 2624570, 4199312, 5249140, 10498280, 20996560]

約数ペア:

[(1, 20996560), (2, 10498280), (4, 5249140), (5, 4199312), (8, 2624570), (10, 2099656), (13, 1615120), (16, 1312285), (20, 1049828), (26, 807560), (40, 524914), (52, 403780), (65, 323024), (80, 262457), (104, 201890), (130, 161512), (169, 124240), (208, 100945), (260, 80756), (338, 62120), (520, 40378), (676, 31060), (845, 24848), (1040, 20189), (1352, 15530), (1553, 13520), (1690, 12424), (2704, 7765), (3106, 6760), (3380, 6212)]