21420280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{113}}^1\times {\mathrm{677}}^1$

素因数の和:808

約数の個数: 64

約数和(自身を含む): 55650240

約数和(自身を除く): 34229960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 113, 140, 226, 280, 452, 565, 677, 791, 904, 1130, 1354, 1582, 2260, 2708, 3164, 3385, 3955, 4520, 4739, 5416, 6328, 6770, 7910, 9478, 13540, 15820, 18956, 23695, 27080, 31640, 37912, 47390, 76501, 94780, 153002, 189560, 306004, 382505, 535507, 612008, 765010, 1071014, 1530020, 2142028, 2677535, 3060040, 4284056, 5355070, 10710140, 21420280]

約数ペア:

[(1, 21420280), (2, 10710140), (4, 5355070), (5, 4284056), (7, 3060040), (8, 2677535), (10, 2142028), (14, 1530020), (20, 1071014), (28, 765010), (35, 612008), (40, 535507), (56, 382505), (70, 306004), (113, 189560), (140, 153002), (226, 94780), (280, 76501), (452, 47390), (565, 37912), (677, 31640), (791, 27080), (904, 23695), (1130, 18956), (1354, 15820), (1582, 13540), (2260, 9478), (2708, 7910), (3164, 6770), (3385, 6328), (3955, 5416), (4520, 4739)]