21388920

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25463}}^1$

素因数の和:25484

約数の個数: 64

約数和(自身を含む): 73336320

約数和(自身を除く): 51947400

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25463, 50926, 76389, 101852, 127315, 152778, 178241, 203704, 254630, 305556, 356482, 381945, 509260, 534723, 611112, 712964, 763890, 891205, 1018520, 1069446, 1425928, 1527780, 1782410, 2138892, 2673615, 3055560, 3564820, 4277784, 5347230, 7129640, 10694460, 21388920]

約数ペア:

[(1, 21388920), (2, 10694460), (3, 7129640), (4, 5347230), (5, 4277784), (6, 3564820), (7, 3055560), (8, 2673615), (10, 2138892), (12, 1782410), (14, 1527780), (15, 1425928), (20, 1069446), (21, 1018520), (24, 891205), (28, 763890), (30, 712964), (35, 611112), (40, 534723), (42, 509260), (56, 381945), (60, 356482), (70, 305556), (84, 254630), (105, 203704), (120, 178241), (140, 152778), (168, 127315), (210, 101852), (280, 76389), (420, 50926), (840, 25463)]