20839760

素因数分解:

$2^4\times 5^1\times {\mathrm{331}}^1\times {\mathrm{787}}^1$

素因数の和:1131

約数の個数: 40

約数和(自身を含む): 48660576

約数和(自身を除く): 27820816

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 331, 662, 787, 1324, 1574, 1655, 2648, 3148, 3310, 3935, 5296, 6296, 6620, 7870, 12592, 13240, 15740, 26480, 31480, 62960, 260497, 520994, 1041988, 1302485, 2083976, 2604970, 4167952, 5209940, 10419880, 20839760]

約数ペア:

[(1, 20839760), (2, 10419880), (4, 5209940), (5, 4167952), (8, 2604970), (10, 2083976), (16, 1302485), (20, 1041988), (40, 520994), (80, 260497), (331, 62960), (662, 31480), (787, 26480), (1324, 15740), (1574, 13240), (1655, 12592), (2648, 7870), (3148, 6620), (3310, 6296), (3935, 5296)]