21490880

素因数分解:

$2^6\times 5^1\times {\mathrm{239}}^1\times {\mathrm{281}}^1$

素因数の和:537

約数の個数: 56

約数和(自身を含む): 51572160

約数和(自身を除く): 30081280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 239, 281, 320, 478, 562, 956, 1124, 1195, 1405, 1912, 2248, 2390, 2810, 3824, 4496, 4780, 5620, 7648, 8992, 9560, 11240, 15296, 17984, 19120, 22480, 38240, 44960, 67159, 76480, 89920, 134318, 268636, 335795, 537272, 671590, 1074544, 1343180, 2149088, 2686360, 4298176, 5372720, 10745440, 21490880]

約数ペア:

[(1, 21490880), (2, 10745440), (4, 5372720), (5, 4298176), (8, 2686360), (10, 2149088), (16, 1343180), (20, 1074544), (32, 671590), (40, 537272), (64, 335795), (80, 268636), (160, 134318), (239, 89920), (281, 76480), (320, 67159), (478, 44960), (562, 38240), (956, 22480), (1124, 19120), (1195, 17984), (1405, 15296), (1912, 11240), (2248, 9560), (2390, 8992), (2810, 7648), (3824, 5620), (4496, 4780)]