20976475

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1$

素因数の和:164

約数の個数: 48

約数和(自身を含む): 30553600

約数和(自身を除く): 9577125

約数列:

[1, 5, 13, 19, 25, 43, 65, 79, 95, 215, 247, 325, 395, 475, 559, 817, 1027, 1075, 1235, 1501, 1975, 2795, 3397, 4085, 5135, 6175, 7505, 10621, 13975, 16985, 19513, 20425, 25675, 37525, 44161, 53105, 64543, 84925, 97565, 220805, 265525, 322715, 487825, 839059, 1104025, 1613575, 4195295, 20976475]

約数ペア:

[(1, 20976475), (5, 4195295), (13, 1613575), (19, 1104025), (25, 839059), (43, 487825), (65, 322715), (79, 265525), (95, 220805), (215, 97565), (247, 84925), (325, 64543), (395, 53105), (475, 44161), (559, 37525), (817, 25675), (1027, 20425), (1075, 19513), (1235, 16985), (1501, 13975), (1975, 10621), (2795, 7505), (3397, 6175), (4085, 5135)]