21393920

素因数分解:

$2^9\times 5^1\times {\mathrm{61}}^1\times {\mathrm{137}}^1$

素因数の和:221

約数の個数: 80

約数和(自身を含む): 52516728

約数和(自身を除く): 31122808

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 137, 160, 244, 256, 274, 305, 320, 488, 512, 548, 610, 640, 685, 976, 1096, 1220, 1280, 1370, 1952, 2192, 2440, 2560, 2740, 3904, 4384, 4880, 5480, 7808, 8357, 8768, 9760, 10960, 15616, 16714, 17536, 19520, 21920, 31232, 33428, 35072, 39040, 41785, 43840, 66856, 70144, 78080, 83570, 87680, 133712, 156160, 167140, 175360, 267424, 334280, 350720, 534848, 668560, 1069696, 1337120, 2139392, 2674240, 4278784, 5348480, 10696960, 21393920]

約数ペア:

[(1, 21393920), (2, 10696960), (4, 5348480), (5, 4278784), (8, 2674240), (10, 2139392), (16, 1337120), (20, 1069696), (32, 668560), (40, 534848), (61, 350720), (64, 334280), (80, 267424), (122, 175360), (128, 167140), (137, 156160), (160, 133712), (244, 87680), (256, 83570), (274, 78080), (305, 70144), (320, 66856), (488, 43840), (512, 41785), (548, 39040), (610, 35072), (640, 33428), (685, 31232), (976, 21920), (1096, 19520), (1220, 17536), (1280, 16714), (1370, 15616), (1952, 10960), (2192, 9760), (2440, 8768), (2560, 8357), (2740, 7808), (3904, 5480), (4384, 4880)]