20451520

素因数分解:

$2^6\times 5^1\times {\mathrm{79}}^1\times {\mathrm{809}}^1$

素因数の和:905

約数の個数: 56

約数和(自身を含む): 49377600

約数和(自身を除く): 28926080

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 79, 80, 158, 160, 316, 320, 395, 632, 790, 809, 1264, 1580, 1618, 2528, 3160, 3236, 4045, 5056, 6320, 6472, 8090, 12640, 12944, 16180, 25280, 25888, 32360, 51776, 63911, 64720, 127822, 129440, 255644, 258880, 319555, 511288, 639110, 1022576, 1278220, 2045152, 2556440, 4090304, 5112880, 10225760, 20451520]

約数ペア:

[(1, 20451520), (2, 10225760), (4, 5112880), (5, 4090304), (8, 2556440), (10, 2045152), (16, 1278220), (20, 1022576), (32, 639110), (40, 511288), (64, 319555), (79, 258880), (80, 255644), (158, 129440), (160, 127822), (316, 64720), (320, 63911), (395, 51776), (632, 32360), (790, 25888), (809, 25280), (1264, 16180), (1580, 12944), (1618, 12640), (2528, 8090), (3160, 6472), (3236, 6320), (4045, 5056)]