18919455

素因数分解:

$3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1$

素因数の和:152

約数の個数: 64

約数和(自身を含む): 34283520

約数和(自身を除く): 15364065

約数列:

[1, 3, 5, 15, 23, 29, 31, 61, 69, 87, 93, 115, 145, 155, 183, 305, 345, 435, 465, 667, 713, 899, 915, 1403, 1769, 1891, 2001, 2139, 2697, 3335, 3565, 4209, 4495, 5307, 5673, 7015, 8845, 9455, 10005, 10695, 13485, 20677, 21045, 26535, 28365, 40687, 43493, 54839, 62031, 103385, 122061, 130479, 164517, 203435, 217465, 274195, 310155, 610305, 652395, 822585, 1261297, 3783891, 6306485, 18919455]

約数ペア:

[(1, 18919455), (3, 6306485), (5, 3783891), (15, 1261297), (23, 822585), (29, 652395), (31, 610305), (61, 310155), (69, 274195), (87, 217465), (93, 203435), (115, 164517), (145, 130479), (155, 122061), (183, 103385), (305, 62031), (345, 54839), (435, 43493), (465, 40687), (667, 28365), (713, 26535), (899, 21045), (915, 20677), (1403, 13485), (1769, 10695), (1891, 10005), (2001, 9455), (2139, 8845), (2697, 7015), (3335, 5673), (3565, 5307), (4209, 4495)]