21778120

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{193}}^1$

素因数の和:255

約数の個数: 128

約数和(自身を含む): 62576640

約数和(自身を除く): 40798520

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 20, 26, 28, 31, 35, 40, 52, 56, 62, 65, 70, 91, 104, 124, 130, 140, 155, 182, 193, 217, 248, 260, 280, 310, 364, 386, 403, 434, 455, 520, 620, 728, 772, 806, 868, 910, 965, 1085, 1240, 1351, 1544, 1612, 1736, 1820, 1930, 2015, 2170, 2509, 2702, 2821, 3224, 3640, 3860, 4030, 4340, 5018, 5404, 5642, 5983, 6755, 7720, 8060, 8680, 10036, 10808, 11284, 11966, 12545, 13510, 14105, 16120, 17563, 20072, 22568, 23932, 25090, 27020, 28210, 29915, 35126, 41881, 47864, 50180, 54040, 56420, 59830, 70252, 77779, 83762, 87815, 100360, 112840, 119660, 140504, 155558, 167524, 175630, 209405, 239320, 311116, 335048, 351260, 388895, 418810, 544453, 622232, 702520, 777790, 837620, 1088906, 1555580, 1675240, 2177812, 2722265, 3111160, 4355624, 5444530, 10889060, 21778120]

約数ペア:

[(1, 21778120), (2, 10889060), (4, 5444530), (5, 4355624), (7, 3111160), (8, 2722265), (10, 2177812), (13, 1675240), (14, 1555580), (20, 1088906), (26, 837620), (28, 777790), (31, 702520), (35, 622232), (40, 544453), (52, 418810), (56, 388895), (62, 351260), (65, 335048), (70, 311116), (91, 239320), (104, 209405), (124, 175630), (130, 167524), (140, 155558), (155, 140504), (182, 119660), (193, 112840), (217, 100360), (248, 87815), (260, 83762), (280, 77779), (310, 70252), (364, 59830), (386, 56420), (403, 54040), (434, 50180), (455, 47864), (520, 41881), (620, 35126), (728, 29915), (772, 28210), (806, 27020), (868, 25090), (910, 23932), (965, 22568), (1085, 20072), (1240, 17563), (1351, 16120), (1544, 14105), (1612, 13510), (1736, 12545), (1820, 11966), (1930, 11284), (2015, 10808), (2170, 10036), (2509, 8680), (2702, 8060), (2821, 7720), (3224, 6755), (3640, 5983), (3860, 5642), (4030, 5404), (4340, 5018)]