20212720

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{103}}^1\times {\mathrm{223}}^1$

素因数の和:350

約数の個数: 80

約数和(自身を含む): 51996672

約数和(自身を除く): 31783952

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 103, 110, 176, 206, 220, 223, 412, 440, 446, 515, 824, 880, 892, 1030, 1115, 1133, 1648, 1784, 2060, 2230, 2266, 2453, 3568, 4120, 4460, 4532, 4906, 5665, 8240, 8920, 9064, 9812, 11330, 12265, 17840, 18128, 19624, 22660, 22969, 24530, 39248, 45320, 45938, 49060, 90640, 91876, 98120, 114845, 183752, 196240, 229690, 252659, 367504, 459380, 505318, 918760, 1010636, 1263295, 1837520, 2021272, 2526590, 4042544, 5053180, 10106360, 20212720]

約数ペア:

[(1, 20212720), (2, 10106360), (4, 5053180), (5, 4042544), (8, 2526590), (10, 2021272), (11, 1837520), (16, 1263295), (20, 1010636), (22, 918760), (40, 505318), (44, 459380), (55, 367504), (80, 252659), (88, 229690), (103, 196240), (110, 183752), (176, 114845), (206, 98120), (220, 91876), (223, 90640), (412, 49060), (440, 45938), (446, 45320), (515, 39248), (824, 24530), (880, 22969), (892, 22660), (1030, 19624), (1115, 18128), (1133, 17840), (1648, 12265), (1784, 11330), (2060, 9812), (2230, 9064), (2266, 8920), (2453, 8240), (3568, 5665), (4120, 4906), (4460, 4532)]