21504520

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{2729}}^1$

素因数の和:2937

約数の個数: 32

約数和(自身を含む): 48648600

約数和(自身を除く): 27144080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 2729, 3940, 5458, 7880, 10916, 13645, 21832, 27290, 54580, 109160, 537613, 1075226, 2150452, 2688065, 4300904, 5376130, 10752260, 21504520]

約数ペア:

[(1, 21504520), (2, 10752260), (4, 5376130), (5, 4300904), (8, 2688065), (10, 2150452), (20, 1075226), (40, 537613), (197, 109160), (394, 54580), (788, 27290), (985, 21832), (1576, 13645), (1970, 10916), (2729, 7880), (3940, 5458)]