21420840

素因数分解:

$2^3\times 3^1\times 5^1\times 7^2\times {\mathrm{3643}}^1$

素因数の和:3671

約数の個数: 96

約数和(自身を含む): 74774880

約数和(自身を除く): 53354040

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 49, 56, 60, 70, 84, 98, 105, 120, 140, 147, 168, 196, 210, 245, 280, 294, 392, 420, 490, 588, 735, 840, 980, 1176, 1470, 1960, 2940, 3643, 5880, 7286, 10929, 14572, 18215, 21858, 25501, 29144, 36430, 43716, 51002, 54645, 72860, 76503, 87432, 102004, 109290, 127505, 145720, 153006, 178507, 204008, 218580, 255010, 306012, 357014, 382515, 437160, 510020, 535521, 612024, 714028, 765030, 892535, 1020040, 1071042, 1428056, 1530060, 1785070, 2142084, 2677605, 3060120, 3570140, 4284168, 5355210, 7140280, 10710420, 21420840]

約数ペア:

[(1, 21420840), (2, 10710420), (3, 7140280), (4, 5355210), (5, 4284168), (6, 3570140), (7, 3060120), (8, 2677605), (10, 2142084), (12, 1785070), (14, 1530060), (15, 1428056), (20, 1071042), (21, 1020040), (24, 892535), (28, 765030), (30, 714028), (35, 612024), (40, 535521), (42, 510020), (49, 437160), (56, 382515), (60, 357014), (70, 306012), (84, 255010), (98, 218580), (105, 204008), (120, 178507), (140, 153006), (147, 145720), (168, 127505), (196, 109290), (210, 102004), (245, 87432), (280, 76503), (294, 72860), (392, 54645), (420, 51002), (490, 43716), (588, 36430), (735, 29144), (840, 25501), (980, 21858), (1176, 18215), (1470, 14572), (1960, 10929), (2940, 7286), (3643, 5880)]