21316880

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{199}}^1$

素因数の和:328

約数の個数: 80

約数和(自身を含む): 54163200

約数和(自身を除く): 32846320

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 103, 104, 130, 199, 206, 208, 260, 398, 412, 515, 520, 796, 824, 995, 1030, 1040, 1339, 1592, 1648, 1990, 2060, 2587, 2678, 3184, 3980, 4120, 5174, 5356, 6695, 7960, 8240, 10348, 10712, 12935, 13390, 15920, 20497, 20696, 21424, 25870, 26780, 40994, 41392, 51740, 53560, 81988, 102485, 103480, 107120, 163976, 204970, 206960, 266461, 327952, 409940, 532922, 819880, 1065844, 1332305, 1639760, 2131688, 2664610, 4263376, 5329220, 10658440, 21316880]

約数ペア:

[(1, 21316880), (2, 10658440), (4, 5329220), (5, 4263376), (8, 2664610), (10, 2131688), (13, 1639760), (16, 1332305), (20, 1065844), (26, 819880), (40, 532922), (52, 409940), (65, 327952), (80, 266461), (103, 206960), (104, 204970), (130, 163976), (199, 107120), (206, 103480), (208, 102485), (260, 81988), (398, 53560), (412, 51740), (515, 41392), (520, 40994), (796, 26780), (824, 25870), (995, 21424), (1030, 20696), (1040, 20497), (1339, 15920), (1592, 13390), (1648, 12935), (1990, 10712), (2060, 10348), (2587, 8240), (2678, 7960), (3184, 6695), (3980, 5356), (4120, 5174)]