20290840

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{251}}^1$

素因数の和:352

約数の個数: 64

約数和(自身を含む): 47900160

約数和(自身を除く): 27609320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 47, 86, 94, 172, 188, 215, 235, 251, 344, 376, 430, 470, 502, 860, 940, 1004, 1255, 1720, 1880, 2008, 2021, 2510, 4042, 5020, 8084, 10040, 10105, 10793, 11797, 16168, 20210, 21586, 23594, 40420, 43172, 47188, 53965, 58985, 80840, 86344, 94376, 107930, 117970, 215860, 235940, 431720, 471880, 507271, 1014542, 2029084, 2536355, 4058168, 5072710, 10145420, 20290840]

約数ペア:

[(1, 20290840), (2, 10145420), (4, 5072710), (5, 4058168), (8, 2536355), (10, 2029084), (20, 1014542), (40, 507271), (43, 471880), (47, 431720), (86, 235940), (94, 215860), (172, 117970), (188, 107930), (215, 94376), (235, 86344), (251, 80840), (344, 58985), (376, 53965), (430, 47188), (470, 43172), (502, 40420), (860, 23594), (940, 21586), (1004, 20210), (1255, 16168), (1720, 11797), (1880, 10793), (2008, 10105), (2021, 10040), (2510, 8084), (4042, 5020)]