21457240

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{197}}^1\times {\mathrm{389}}^1$

素因数の和:604

約数の個数: 64

約数和(自身を含む): 55598400

約数和(自身を除く): 34141160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 197, 280, 389, 394, 778, 788, 985, 1379, 1556, 1576, 1945, 1970, 2723, 2758, 3112, 3890, 3940, 5446, 5516, 6895, 7780, 7880, 10892, 11032, 13615, 13790, 15560, 21784, 27230, 27580, 54460, 55160, 76633, 108920, 153266, 306532, 383165, 536431, 613064, 766330, 1072862, 1532660, 2145724, 2682155, 3065320, 4291448, 5364310, 10728620, 21457240]

約数ペア:

[(1, 21457240), (2, 10728620), (4, 5364310), (5, 4291448), (7, 3065320), (8, 2682155), (10, 2145724), (14, 1532660), (20, 1072862), (28, 766330), (35, 613064), (40, 536431), (56, 383165), (70, 306532), (140, 153266), (197, 108920), (280, 76633), (389, 55160), (394, 54460), (778, 27580), (788, 27230), (985, 21784), (1379, 15560), (1556, 13790), (1576, 13615), (1945, 11032), (1970, 10892), (2723, 7880), (2758, 7780), (3112, 6895), (3890, 5516), (3940, 5446)]