21021784

素因数分解:

$2^3\times 7^3\times {\mathrm{47}}^1\times {\mathrm{163}}^1$

素因数の和:237

約数の個数: 64

約数和(自身を含む): 47232000

約数和(自身を除く): 26210216

約数列:

[1, 2, 4, 7, 8, 14, 28, 47, 49, 56, 94, 98, 163, 188, 196, 326, 329, 343, 376, 392, 652, 658, 686, 1141, 1304, 1316, 1372, 2282, 2303, 2632, 2744, 4564, 4606, 7661, 7987, 9128, 9212, 15322, 15974, 16121, 18424, 30644, 31948, 32242, 53627, 55909, 61288, 63896, 64484, 107254, 111818, 128968, 214508, 223636, 375389, 429016, 447272, 750778, 1501556, 2627723, 3003112, 5255446, 10510892, 21021784]

約数ペア:

[(1, 21021784), (2, 10510892), (4, 5255446), (7, 3003112), (8, 2627723), (14, 1501556), (28, 750778), (47, 447272), (49, 429016), (56, 375389), (94, 223636), (98, 214508), (163, 128968), (188, 111818), (196, 107254), (326, 64484), (329, 63896), (343, 61288), (376, 55909), (392, 53627), (652, 32242), (658, 31948), (686, 30644), (1141, 18424), (1304, 16121), (1316, 15974), (1372, 15322), (2282, 9212), (2303, 9128), (2632, 7987), (2744, 7661), (4564, 4606)]