21648640

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{1301}}^1$

素因数の和:1335

約数の個数: 72

約数和(自身を含む): 55887048

約数和(自身を除く): 34238408

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, 1280, 1301, 1664, 2080, 2602, 3328, 4160, 5204, 6505, 8320, 10408, 13010, 16640, 16913, 20816, 26020, 33826, 41632, 52040, 67652, 83264, 84565, 104080, 135304, 166528, 169130, 208160, 270608, 333056, 338260, 416320, 541216, 676520, 832640, 1082432, 1353040, 1665280, 2164864, 2706080, 4329728, 5412160, 10824320, 21648640]

約数ペア:

[(1, 21648640), (2, 10824320), (4, 5412160), (5, 4329728), (8, 2706080), (10, 2164864), (13, 1665280), (16, 1353040), (20, 1082432), (26, 832640), (32, 676520), (40, 541216), (52, 416320), (64, 338260), (65, 333056), (80, 270608), (104, 208160), (128, 169130), (130, 166528), (160, 135304), (208, 104080), (256, 84565), (260, 83264), (320, 67652), (416, 52040), (520, 41632), (640, 33826), (832, 26020), (1040, 20816), (1280, 16913), (1301, 16640), (1664, 13010), (2080, 10408), (2602, 8320), (3328, 6505), (4160, 5204)]