28736721

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{139}}^1$

素因数の和:211

約数の個数: 64

約数和(自身を含む): 50176000

約数和(自身を除く): 21439279

約数列:

[1, 3, 9, 13, 19, 27, 31, 39, 57, 93, 117, 139, 171, 247, 279, 351, 403, 417, 513, 589, 741, 837, 1209, 1251, 1767, 1807, 2223, 2641, 3627, 3753, 4309, 5301, 5421, 6669, 7657, 7923, 10881, 12927, 15903, 16263, 22971, 23769, 34333, 38781, 48789, 56017, 68913, 71307, 81871, 102999, 116343, 168051, 206739, 245613, 308997, 504153, 736839, 926991, 1064323, 1512459, 2210517, 3192969, 9578907, 28736721]

約数ペア:

[(1, 28736721), (3, 9578907), (9, 3192969), (13, 2210517), (19, 1512459), (27, 1064323), (31, 926991), (39, 736839), (57, 504153), (93, 308997), (117, 245613), (139, 206739), (171, 168051), (247, 116343), (279, 102999), (351, 81871), (403, 71307), (417, 68913), (513, 56017), (589, 48789), (741, 38781), (837, 34333), (1209, 23769), (1251, 22971), (1767, 16263), (1807, 15903), (2223, 12927), (2641, 10881), (3627, 7923), (3753, 7657), (4309, 6669), (5301, 5421)]