81857825

素因数分解:

$5^2\times 7^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{191}}^1$

素因数の和:318

約数の個数: 48

約数和(自身を含む): 121896960

約数和(自身を除く): 40039135

約数列:

[1, 5, 7, 25, 31, 35, 79, 155, 175, 191, 217, 395, 553, 775, 955, 1085, 1337, 1975, 2449, 2765, 4775, 5425, 5921, 6685, 12245, 13825, 15089, 17143, 29605, 33425, 41447, 61225, 75445, 85715, 105623, 148025, 207235, 377225, 428575, 467759, 528115, 1036175, 2338795, 2640575, 3274313, 11693975, 16371565, 81857825]

約数ペア:

[(1, 81857825), (5, 16371565), (7, 11693975), (25, 3274313), (31, 2640575), (35, 2338795), (79, 1036175), (155, 528115), (175, 467759), (191, 428575), (217, 377225), (395, 207235), (553, 148025), (775, 105623), (955, 85715), (1085, 75445), (1337, 61225), (1975, 41447), (2449, 33425), (2765, 29605), (4775, 17143), (5425, 15089), (5921, 13825), (6685, 12245)]