21077680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^2\times {\mathrm{1559}}^1$

素因数の和:1598

約数の個数: 60

約数和(自身を含む): 53099280

約数和(自身を除く): 32021600

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 169, 208, 260, 338, 520, 676, 845, 1040, 1352, 1559, 1690, 2704, 3118, 3380, 6236, 6760, 7795, 12472, 13520, 15590, 20267, 24944, 31180, 40534, 62360, 81068, 101335, 124720, 162136, 202670, 263471, 324272, 405340, 526942, 810680, 1053884, 1317355, 1621360, 2107768, 2634710, 4215536, 5269420, 10538840, 21077680]

約数ペア:

[(1, 21077680), (2, 10538840), (4, 5269420), (5, 4215536), (8, 2634710), (10, 2107768), (13, 1621360), (16, 1317355), (20, 1053884), (26, 810680), (40, 526942), (52, 405340), (65, 324272), (80, 263471), (104, 202670), (130, 162136), (169, 124720), (208, 101335), (260, 81068), (338, 62360), (520, 40534), (676, 31180), (845, 24944), (1040, 20267), (1352, 15590), (1559, 13520), (1690, 12472), (2704, 7795), (3118, 6760), (3380, 6236)]