21064816

素因数分解:

$2^4\times {\mathrm{41}}^1\times {\mathrm{163}}^1\times {\mathrm{197}}^1$

素因数の和:409

約数の個数: 40

約数和(自身を含む): 42278544

約数和(自身を除く): 21213728

約数列:

[1, 2, 4, 8, 16, 41, 82, 163, 164, 197, 326, 328, 394, 652, 656, 788, 1304, 1576, 2608, 3152, 6683, 8077, 13366, 16154, 26732, 32111, 32308, 53464, 64222, 64616, 106928, 128444, 129232, 256888, 513776, 1316551, 2633102, 5266204, 10532408, 21064816]

約数ペア:

[(1, 21064816), (2, 10532408), (4, 5266204), (8, 2633102), (16, 1316551), (41, 513776), (82, 256888), (163, 129232), (164, 128444), (197, 106928), (326, 64616), (328, 64222), (394, 53464), (652, 32308), (656, 32111), (788, 26732), (1304, 16154), (1576, 13366), (2608, 8077), (3152, 6683)]