21990280

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^2\times {\mathrm{3253}}^1$

素因数の和:3290

約数の個数: 48

約数和(自身を含む): 53593380

約数和(自身を除く): 31603100

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 169, 260, 338, 520, 676, 845, 1352, 1690, 3253, 3380, 6506, 6760, 13012, 16265, 26024, 32530, 42289, 65060, 84578, 130120, 169156, 211445, 338312, 422890, 549757, 845780, 1099514, 1691560, 2199028, 2748785, 4398056, 5497570, 10995140, 21990280]

約数ペア:

[(1, 21990280), (2, 10995140), (4, 5497570), (5, 4398056), (8, 2748785), (10, 2199028), (13, 1691560), (20, 1099514), (26, 845780), (40, 549757), (52, 422890), (65, 338312), (104, 211445), (130, 169156), (169, 130120), (260, 84578), (338, 65060), (520, 42289), (676, 32530), (845, 26024), (1352, 16265), (1690, 13012), (3253, 6760), (3380, 6506)]