21171220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{97}}^1\times {\mathrm{1559}}^1$

素因数の和:1672

約数の個数: 48

約数和(自身を含む): 51367680

約数和(自身を除く): 30196460

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 97, 140, 194, 388, 485, 679, 970, 1358, 1559, 1940, 2716, 3118, 3395, 6236, 6790, 7795, 10913, 13580, 15590, 21826, 31180, 43652, 54565, 109130, 151223, 218260, 302446, 604892, 756115, 1058561, 1512230, 2117122, 3024460, 4234244, 5292805, 10585610, 21171220]

約数ペア:

[(1, 21171220), (2, 10585610), (4, 5292805), (5, 4234244), (7, 3024460), (10, 2117122), (14, 1512230), (20, 1058561), (28, 756115), (35, 604892), (70, 302446), (97, 218260), (140, 151223), (194, 109130), (388, 54565), (485, 43652), (679, 31180), (970, 21826), (1358, 15590), (1559, 13580), (1940, 10913), (2716, 7795), (3118, 6790), (3395, 6236)]