20640025

素因数分解:

$5^2\times 7^3\times {\mathrm{29}}^1\times {\mathrm{83}}^1$

素因数の和:143

約数の個数: 48

約数和(自身を含む): 31248000

約数和(自身を除く): 10607975

約数列:

[1, 5, 7, 25, 29, 35, 49, 83, 145, 175, 203, 245, 343, 415, 581, 725, 1015, 1225, 1421, 1715, 2075, 2407, 2905, 4067, 5075, 7105, 8575, 9947, 12035, 14525, 16849, 20335, 28469, 35525, 49735, 60175, 84245, 101675, 117943, 142345, 248675, 421225, 589715, 711725, 825601, 2948575, 4128005, 20640025]

約数ペア:

[(1, 20640025), (5, 4128005), (7, 2948575), (25, 825601), (29, 711725), (35, 589715), (49, 421225), (83, 248675), (145, 142345), (175, 117943), (203, 101675), (245, 84245), (343, 60175), (415, 49735), (581, 35525), (725, 28469), (1015, 20335), (1225, 16849), (1421, 14525), (1715, 12035), (2075, 9947), (2407, 8575), (2905, 7105), (4067, 5075)]