20800040

素因数分解:

$2^3\times 5^1\times {\mathrm{331}}^1\times {\mathrm{1571}}^1$

素因数の和:1913

約数の個数: 32

約数和(自身を含む): 46971360

約数和(自身を除く): 26171320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 331, 662, 1324, 1571, 1655, 2648, 3142, 3310, 6284, 6620, 7855, 12568, 13240, 15710, 31420, 62840, 520001, 1040002, 2080004, 2600005, 4160008, 5200010, 10400020, 20800040]

約数ペア:

[(1, 20800040), (2, 10400020), (4, 5200010), (5, 4160008), (8, 2600005), (10, 2080004), (20, 1040002), (40, 520001), (331, 62840), (662, 31420), (1324, 15710), (1571, 13240), (1655, 12568), (2648, 7855), (3142, 6620), (3310, 6284)]