20787515

素因数分解:

$5^1\times 7^3\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1$

素因数の和:97

約数の個数: 64

約数和(自身を含む): 33177600

約数和(自身を除く): 12390085

約数列:

[1, 5, 7, 17, 23, 31, 35, 49, 85, 115, 119, 155, 161, 217, 245, 343, 391, 527, 595, 713, 805, 833, 1085, 1127, 1519, 1715, 1955, 2635, 2737, 3565, 3689, 4165, 4991, 5635, 5831, 7595, 7889, 10633, 12121, 13685, 18445, 19159, 24955, 25823, 29155, 34937, 39445, 53165, 60605, 84847, 95795, 129115, 134113, 174685, 180761, 244559, 424235, 593929, 670565, 903805, 1222795, 2969645, 4157503, 20787515]

約数ペア:

[(1, 20787515), (5, 4157503), (7, 2969645), (17, 1222795), (23, 903805), (31, 670565), (35, 593929), (49, 424235), (85, 244559), (115, 180761), (119, 174685), (155, 134113), (161, 129115), (217, 95795), (245, 84847), (343, 60605), (391, 53165), (527, 39445), (595, 34937), (713, 29155), (805, 25823), (833, 24955), (1085, 19159), (1127, 18445), (1519, 13685), (1715, 12121), (1955, 10633), (2635, 7889), (2737, 7595), (3565, 5831), (3689, 5635), (4165, 4991)]