21249280

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{1277}}^1$

素因数の和:1311

約数の個数: 72

約数和(自身を含む): 54856872

約数和(自身を除く): 33607592

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 520, 640, 832, 1040, 1277, 1280, 1664, 2080, 2554, 3328, 4160, 5108, 6385, 8320, 10216, 12770, 16601, 16640, 20432, 25540, 33202, 40864, 51080, 66404, 81728, 83005, 102160, 132808, 163456, 166010, 204320, 265616, 326912, 332020, 408640, 531232, 664040, 817280, 1062464, 1328080, 1634560, 2124928, 2656160, 4249856, 5312320, 10624640, 21249280]

約数ペア:

[(1, 21249280), (2, 10624640), (4, 5312320), (5, 4249856), (8, 2656160), (10, 2124928), (13, 1634560), (16, 1328080), (20, 1062464), (26, 817280), (32, 664040), (40, 531232), (52, 408640), (64, 332020), (65, 326912), (80, 265616), (104, 204320), (128, 166010), (130, 163456), (160, 132808), (208, 102160), (256, 83005), (260, 81728), (320, 66404), (416, 51080), (520, 40864), (640, 33202), (832, 25540), (1040, 20432), (1277, 16640), (1280, 16601), (1664, 12770), (2080, 10216), (2554, 8320), (3328, 6385), (4160, 5108)]