21850220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{97}}^1\times {\mathrm{1609}}^1$

素因数の和:1722

約数の個数: 48

約数和(自身を含む): 53014080

約数和(自身を除く): 31163860

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 97, 140, 194, 388, 485, 679, 970, 1358, 1609, 1940, 2716, 3218, 3395, 6436, 6790, 8045, 11263, 13580, 16090, 22526, 32180, 45052, 56315, 112630, 156073, 225260, 312146, 624292, 780365, 1092511, 1560730, 2185022, 3121460, 4370044, 5462555, 10925110, 21850220]

約数ペア:

[(1, 21850220), (2, 10925110), (4, 5462555), (5, 4370044), (7, 3121460), (10, 2185022), (14, 1560730), (20, 1092511), (28, 780365), (35, 624292), (70, 312146), (97, 225260), (140, 156073), (194, 112630), (388, 56315), (485, 45052), (679, 32180), (970, 22526), (1358, 16090), (1609, 13580), (1940, 11263), (2716, 8045), (3218, 6790), (3395, 6436)]