20781255

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{101}}^1$

素因数の和:192

約数の個数: 64

約数和(自身を含む): 38776320

約数和(自身を除く): 17995065

約数列:

[1, 3, 5, 11, 15, 29, 33, 43, 55, 87, 101, 129, 145, 165, 215, 303, 319, 435, 473, 505, 645, 957, 1111, 1247, 1419, 1515, 1595, 2365, 2929, 3333, 3741, 4343, 4785, 5555, 6235, 7095, 8787, 13029, 13717, 14645, 16665, 18705, 21715, 32219, 41151, 43935, 47773, 65145, 68585, 96657, 125947, 143319, 161095, 205755, 238865, 377841, 483285, 629735, 716595, 1385417, 1889205, 4156251, 6927085, 20781255]

約数ペア:

[(1, 20781255), (3, 6927085), (5, 4156251), (11, 1889205), (15, 1385417), (29, 716595), (33, 629735), (43, 483285), (55, 377841), (87, 238865), (101, 205755), (129, 161095), (145, 143319), (165, 125947), (215, 96657), (303, 68585), (319, 65145), (435, 47773), (473, 43935), (505, 41151), (645, 32219), (957, 21715), (1111, 18705), (1247, 16665), (1419, 14645), (1515, 13717), (1595, 13029), (2365, 8787), (2929, 7095), (3333, 6235), (3741, 5555), (4343, 4785)]