21316515

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{137}}^1$

素因数の和:220

約数の個数: 64

約数和(自身を含む): 40061952

約数和(自身を除く): 18745437

約数列:

[1, 3, 5, 11, 15, 23, 33, 41, 55, 69, 115, 123, 137, 165, 205, 253, 345, 411, 451, 615, 685, 759, 943, 1265, 1353, 1507, 2055, 2255, 2829, 3151, 3795, 4521, 4715, 5617, 6765, 7535, 9453, 10373, 14145, 15755, 16851, 22605, 28085, 31119, 34661, 47265, 51865, 61787, 84255, 103983, 129191, 155595, 173305, 185361, 308935, 387573, 519915, 645955, 926805, 1421101, 1937865, 4263303, 7105505, 21316515]

約数ペア:

[(1, 21316515), (3, 7105505), (5, 4263303), (11, 1937865), (15, 1421101), (23, 926805), (33, 645955), (41, 519915), (55, 387573), (69, 308935), (115, 185361), (123, 173305), (137, 155595), (165, 129191), (205, 103983), (253, 84255), (345, 61787), (411, 51865), (451, 47265), (615, 34661), (685, 31119), (759, 28085), (943, 22605), (1265, 16851), (1353, 15755), (1507, 14145), (2055, 10373), (2255, 9453), (2829, 7535), (3151, 6765), (3795, 5617), (4521, 4715)]