20456960

素因数分解:

$2^9\times 5^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1$

素因数の和:215

約数の個数: 80

約数和(自身を含む): 50233392

約数和(自身を除く): 29776432

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 131, 160, 244, 256, 262, 305, 320, 488, 512, 524, 610, 640, 655, 976, 1048, 1220, 1280, 1310, 1952, 2096, 2440, 2560, 2620, 3904, 4192, 4880, 5240, 7808, 7991, 8384, 9760, 10480, 15616, 15982, 16768, 19520, 20960, 31232, 31964, 33536, 39040, 39955, 41920, 63928, 67072, 78080, 79910, 83840, 127856, 156160, 159820, 167680, 255712, 319640, 335360, 511424, 639280, 1022848, 1278560, 2045696, 2557120, 4091392, 5114240, 10228480, 20456960]

約数ペア:

[(1, 20456960), (2, 10228480), (4, 5114240), (5, 4091392), (8, 2557120), (10, 2045696), (16, 1278560), (20, 1022848), (32, 639280), (40, 511424), (61, 335360), (64, 319640), (80, 255712), (122, 167680), (128, 159820), (131, 156160), (160, 127856), (244, 83840), (256, 79910), (262, 78080), (305, 67072), (320, 63928), (488, 41920), (512, 39955), (524, 39040), (610, 33536), (640, 31964), (655, 31232), (976, 20960), (1048, 19520), (1220, 16768), (1280, 15982), (1310, 15616), (1952, 10480), (2096, 9760), (2440, 8384), (2560, 7991), (2620, 7808), (3904, 5240), (4192, 4880)]