21651880

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{1873}}^1$

素因数の和:1918

約数の個数: 48

約数和(自身を含む): 51778620

約数和(自身を除く): 30126740

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 289, 340, 578, 680, 1156, 1445, 1873, 2312, 2890, 3746, 5780, 7492, 9365, 11560, 14984, 18730, 31841, 37460, 63682, 74920, 127364, 159205, 254728, 318410, 541297, 636820, 1082594, 1273640, 2165188, 2706485, 4330376, 5412970, 10825940, 21651880]

約数ペア:

[(1, 21651880), (2, 10825940), (4, 5412970), (5, 4330376), (8, 2706485), (10, 2165188), (17, 1273640), (20, 1082594), (34, 636820), (40, 541297), (68, 318410), (85, 254728), (136, 159205), (170, 127364), (289, 74920), (340, 63682), (578, 37460), (680, 31841), (1156, 18730), (1445, 14984), (1873, 11560), (2312, 9365), (2890, 7492), (3746, 5780)]