21029720

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{12823}}^1$

素因数の和:12875

約数の個数: 32

約数和(自身を含む): 48474720

約数和(自身を除く): 27445000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 12823, 25646, 51292, 64115, 102584, 128230, 256460, 512920, 525743, 1051486, 2102972, 2628715, 4205944, 5257430, 10514860, 21029720]

約数ペア:

[(1, 21029720), (2, 10514860), (4, 5257430), (5, 4205944), (8, 2628715), (10, 2102972), (20, 1051486), (40, 525743), (41, 512920), (82, 256460), (164, 128230), (205, 102584), (328, 64115), (410, 51292), (820, 25646), (1640, 12823)]