20505975

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{139}}^1\times {\mathrm{281}}^1$

素因数の和:440

約数の個数: 48

約数和(自身を含む): 39164160

約数和(自身を除く): 18658185

約数列:

[1, 3, 5, 7, 15, 21, 25, 35, 75, 105, 139, 175, 281, 417, 525, 695, 843, 973, 1405, 1967, 2085, 2919, 3475, 4215, 4865, 5901, 7025, 9835, 10425, 14595, 21075, 24325, 29505, 39059, 49175, 72975, 117177, 147525, 195295, 273413, 585885, 820239, 976475, 1367065, 2929425, 4101195, 6835325, 20505975]

約数ペア:

[(1, 20505975), (3, 6835325), (5, 4101195), (7, 2929425), (15, 1367065), (21, 976475), (25, 820239), (35, 585885), (75, 273413), (105, 195295), (139, 147525), (175, 117177), (281, 72975), (417, 49175), (525, 39059), (695, 29505), (843, 24325), (973, 21075), (1405, 14595), (1967, 10425), (2085, 9835), (2919, 7025), (3475, 5901), (4215, 4865)]