21906040

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{409}}^1$

素因数の和:536

約数の個数: 64

約数和(自身を含む): 53726400

約数和(自身を除く): 31820360

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 103, 104, 130, 206, 260, 409, 412, 515, 520, 818, 824, 1030, 1339, 1636, 2045, 2060, 2678, 3272, 4090, 4120, 5317, 5356, 6695, 8180, 10634, 10712, 13390, 16360, 21268, 26585, 26780, 42127, 42536, 53170, 53560, 84254, 106340, 168508, 210635, 212680, 337016, 421270, 547651, 842540, 1095302, 1685080, 2190604, 2738255, 4381208, 5476510, 10953020, 21906040]

約数ペア:

[(1, 21906040), (2, 10953020), (4, 5476510), (5, 4381208), (8, 2738255), (10, 2190604), (13, 1685080), (20, 1095302), (26, 842540), (40, 547651), (52, 421270), (65, 337016), (103, 212680), (104, 210635), (130, 168508), (206, 106340), (260, 84254), (409, 53560), (412, 53170), (515, 42536), (520, 42127), (818, 26780), (824, 26585), (1030, 21268), (1339, 16360), (1636, 13390), (2045, 10712), (2060, 10634), (2678, 8180), (3272, 6695), (4090, 5356), (4120, 5317)]