21280175

素因数分解:

$5^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{311}}^1$

素因数の和:368

約数の個数: 48

約数和(自身を含む): 33426432

約数和(自身を除く): 12146257

約数列:

[1, 5, 7, 17, 23, 25, 35, 85, 115, 119, 161, 175, 311, 391, 425, 575, 595, 805, 1555, 1955, 2177, 2737, 2975, 4025, 5287, 7153, 7775, 9775, 10885, 13685, 26435, 35765, 37009, 50071, 54425, 68425, 121601, 132175, 178825, 185045, 250355, 608005, 851207, 925225, 1251775, 3040025, 4256035, 21280175]

約数ペア:

[(1, 21280175), (5, 4256035), (7, 3040025), (17, 1251775), (23, 925225), (25, 851207), (35, 608005), (85, 250355), (115, 185045), (119, 178825), (161, 132175), (175, 121601), (311, 68425), (391, 54425), (425, 50071), (575, 37009), (595, 35765), (805, 26435), (1555, 13685), (1955, 10885), (2177, 9775), (2737, 7775), (2975, 7153), (4025, 5287)]