21390160

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{109}}^1\times {\mathrm{223}}^1$

素因数の和:356

約数の個数: 80

約数和(自身を含む): 54996480

約数和(自身を除く): 33606320

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 109, 110, 176, 218, 220, 223, 436, 440, 446, 545, 872, 880, 892, 1090, 1115, 1199, 1744, 1784, 2180, 2230, 2398, 2453, 3568, 4360, 4460, 4796, 4906, 5995, 8720, 8920, 9592, 9812, 11990, 12265, 17840, 19184, 19624, 23980, 24307, 24530, 39248, 47960, 48614, 49060, 95920, 97228, 98120, 121535, 194456, 196240, 243070, 267377, 388912, 486140, 534754, 972280, 1069508, 1336885, 1944560, 2139016, 2673770, 4278032, 5347540, 10695080, 21390160]

約数ペア:

[(1, 21390160), (2, 10695080), (4, 5347540), (5, 4278032), (8, 2673770), (10, 2139016), (11, 1944560), (16, 1336885), (20, 1069508), (22, 972280), (40, 534754), (44, 486140), (55, 388912), (80, 267377), (88, 243070), (109, 196240), (110, 194456), (176, 121535), (218, 98120), (220, 97228), (223, 95920), (436, 49060), (440, 48614), (446, 47960), (545, 39248), (872, 24530), (880, 24307), (892, 23980), (1090, 19624), (1115, 19184), (1199, 17840), (1744, 12265), (1784, 11990), (2180, 9812), (2230, 9592), (2398, 8920), (2453, 8720), (3568, 5995), (4360, 4906), (4460, 4796)]