28780020

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{281}}^1\times {\mathrm{569}}^1$

素因数の和:865

約数の個数: 72

約数和(自身を含む): 87764040

約数和(自身を除く): 58984020

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 281, 562, 569, 843, 1124, 1138, 1405, 1686, 1707, 2276, 2529, 2810, 2845, 3372, 3414, 4215, 5058, 5121, 5620, 5690, 6828, 8430, 8535, 10116, 10242, 11380, 12645, 16860, 17070, 20484, 25290, 25605, 34140, 50580, 51210, 102420, 159889, 319778, 479667, 639556, 799445, 959334, 1439001, 1598890, 1918668, 2398335, 2878002, 3197780, 4796670, 5756004, 7195005, 9593340, 14390010, 28780020]

約数ペア:

[(1, 28780020), (2, 14390010), (3, 9593340), (4, 7195005), (5, 5756004), (6, 4796670), (9, 3197780), (10, 2878002), (12, 2398335), (15, 1918668), (18, 1598890), (20, 1439001), (30, 959334), (36, 799445), (45, 639556), (60, 479667), (90, 319778), (180, 159889), (281, 102420), (562, 51210), (569, 50580), (843, 34140), (1124, 25605), (1138, 25290), (1405, 20484), (1686, 17070), (1707, 16860), (2276, 12645), (2529, 11380), (2810, 10242), (2845, 10116), (3372, 8535), (3414, 8430), (4215, 6828), (5058, 5690), (5121, 5620)]