19806875

素因数分解:

$5^4\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{67}}^1$

素因数の和:141

約数の個数: 40

約数和(自身を含む): 28041024

約数和(自身を除く): 8234149

約数列:

[1, 5, 11, 25, 43, 55, 67, 125, 215, 275, 335, 473, 625, 737, 1075, 1375, 1675, 2365, 2881, 3685, 5375, 6875, 8375, 11825, 14405, 18425, 26875, 31691, 41875, 59125, 72025, 92125, 158455, 295625, 360125, 460625, 792275, 1800625, 3961375, 19806875]

約数ペア:

[(1, 19806875), (5, 3961375), (11, 1800625), (25, 792275), (43, 460625), (55, 360125), (67, 295625), (125, 158455), (215, 92125), (275, 72025), (335, 59125), (473, 41875), (625, 31691), (737, 26875), (1075, 18425), (1375, 14405), (1675, 11825), (2365, 8375), (2881, 6875), (3685, 5375)]