20821450

素因数分解:

$2^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{311}}^1$

素因数の和:439

約数の個数: 48

約数和(自身を含む): 42247296

約数和(自身を除く): 21425846

約数列:

[1, 2, 5, 10, 13, 25, 26, 50, 65, 103, 130, 206, 311, 325, 515, 622, 650, 1030, 1339, 1555, 2575, 2678, 3110, 4043, 5150, 6695, 7775, 8086, 13390, 15550, 20215, 32033, 33475, 40430, 64066, 66950, 101075, 160165, 202150, 320330, 416429, 800825, 832858, 1601650, 2082145, 4164290, 10410725, 20821450]

約数ペア:

[(1, 20821450), (2, 10410725), (5, 4164290), (10, 2082145), (13, 1601650), (25, 832858), (26, 800825), (50, 416429), (65, 320330), (103, 202150), (130, 160165), (206, 101075), (311, 66950), (325, 64066), (515, 40430), (622, 33475), (650, 32033), (1030, 20215), (1339, 15550), (1555, 13390), (2575, 8086), (2678, 7775), (3110, 6695), (4043, 5150)]