19720818

素因数分解:

$2^1\times 3^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{1187}}^1$

素因数の和:1279

約数の個数: 48

約数和(自身を含む): 46702656

約数和(自身を除く): 26981838

約数列:

[1, 2, 3, 6, 9, 13, 18, 26, 39, 71, 78, 117, 142, 213, 234, 426, 639, 923, 1187, 1278, 1846, 2374, 2769, 3561, 5538, 7122, 8307, 10683, 15431, 16614, 21366, 30862, 46293, 84277, 92586, 138879, 168554, 252831, 277758, 505662, 758493, 1095601, 1516986, 2191202, 3286803, 6573606, 9860409, 19720818]

約数ペア:

[(1, 19720818), (2, 9860409), (3, 6573606), (6, 3286803), (9, 2191202), (13, 1516986), (18, 1095601), (26, 758493), (39, 505662), (71, 277758), (78, 252831), (117, 168554), (142, 138879), (213, 92586), (234, 84277), (426, 46293), (639, 30862), (923, 21366), (1187, 16614), (1278, 15431), (1846, 10683), (2374, 8307), (2769, 7122), (3561, 5538)]