18721815

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1$

素因数の和:192

約数の個数: 64

約数和(自身を含む): 36188160

約数和(自身を除く): 17466345

約数列:

[1, 3, 5, 7, 15, 21, 35, 37, 61, 79, 105, 111, 183, 185, 237, 259, 305, 395, 427, 553, 555, 777, 915, 1185, 1281, 1295, 1659, 2135, 2257, 2765, 2923, 3885, 4819, 6405, 6771, 8295, 8769, 11285, 14457, 14615, 15799, 20461, 24095, 33733, 33855, 43845, 47397, 61383, 72285, 78995, 101199, 102305, 168665, 178303, 236985, 306915, 505995, 534909, 891515, 1248121, 2674545, 3744363, 6240605, 18721815]

約数ペア:

[(1, 18721815), (3, 6240605), (5, 3744363), (7, 2674545), (15, 1248121), (21, 891515), (35, 534909), (37, 505995), (61, 306915), (79, 236985), (105, 178303), (111, 168665), (183, 102305), (185, 101199), (237, 78995), (259, 72285), (305, 61383), (395, 47397), (427, 43845), (553, 33855), (555, 33733), (777, 24095), (915, 20461), (1185, 15799), (1281, 14615), (1295, 14457), (1659, 11285), (2135, 8769), (2257, 8295), (2765, 6771), (2923, 6405), (3885, 4819)]