20685015

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{1861}}^1$

素因数の和:1904

約数の個数: 48

約数和(自身を含む): 40666080

約数和(自身を除く): 19981065

約数列:

[1, 3, 5, 9, 13, 15, 19, 39, 45, 57, 65, 95, 117, 171, 195, 247, 285, 585, 741, 855, 1235, 1861, 2223, 3705, 5583, 9305, 11115, 16749, 24193, 27915, 35359, 72579, 83745, 106077, 120965, 176795, 217737, 318231, 362895, 459667, 530385, 1088685, 1379001, 1591155, 2298335, 4137003, 6895005, 20685015]

約数ペア:

[(1, 20685015), (3, 6895005), (5, 4137003), (9, 2298335), (13, 1591155), (15, 1379001), (19, 1088685), (39, 530385), (45, 459667), (57, 362895), (65, 318231), (95, 217737), (117, 176795), (171, 120965), (195, 106077), (247, 83745), (285, 72579), (585, 35359), (741, 27915), (855, 24193), (1235, 16749), (1861, 11115), (2223, 9305), (3705, 5583)]