21540120

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25643}}^1$

素因数の和:25664

約数の個数: 64

約数和(自身を含む): 73854720

約数和(自身を除く): 52314600

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25643, 51286, 76929, 102572, 128215, 153858, 179501, 205144, 256430, 307716, 359002, 384645, 512860, 538503, 615432, 718004, 769290, 897505, 1025720, 1077006, 1436008, 1538580, 1795010, 2154012, 2692515, 3077160, 3590020, 4308024, 5385030, 7180040, 10770060, 21540120]

約数ペア:

[(1, 21540120), (2, 10770060), (3, 7180040), (4, 5385030), (5, 4308024), (6, 3590020), (7, 3077160), (8, 2692515), (10, 2154012), (12, 1795010), (14, 1538580), (15, 1436008), (20, 1077006), (21, 1025720), (24, 897505), (28, 769290), (30, 718004), (35, 615432), (40, 538503), (42, 512860), (56, 384645), (60, 359002), (70, 307716), (84, 256430), (105, 205144), (120, 179501), (140, 153858), (168, 128215), (210, 102572), (280, 76929), (420, 51286), (840, 25643)]