20431875

素因数分解:

$3^1\times 5^4\times {\mathrm{17}}^1\times {\mathrm{641}}^1$

素因数の和:681

約数の個数: 40

約数和(自身を含む): 36100944

約数和(自身を除く): 15669069

約数列:

[1, 3, 5, 15, 17, 25, 51, 75, 85, 125, 255, 375, 425, 625, 641, 1275, 1875, 1923, 2125, 3205, 6375, 9615, 10625, 10897, 16025, 31875, 32691, 48075, 54485, 80125, 163455, 240375, 272425, 400625, 817275, 1201875, 1362125, 4086375, 6810625, 20431875]

約数ペア:

[(1, 20431875), (3, 6810625), (5, 4086375), (15, 1362125), (17, 1201875), (25, 817275), (51, 400625), (75, 272425), (85, 240375), (125, 163455), (255, 80125), (375, 54485), (425, 48075), (625, 32691), (641, 31875), (1275, 16025), (1875, 10897), (1923, 10625), (2125, 9615), (3205, 6375)]