21440286

素因数分解:

$2^1\times 3^2\times 7^1\times {\mathrm{263}}^1\times {\mathrm{647}}^1$

素因数の和:925

約数の個数: 48

約数和(自身を含む): 53374464

約数和(自身を除く): 31934178

約数列:

[1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126, 263, 526, 647, 789, 1294, 1578, 1841, 1941, 2367, 3682, 3882, 4529, 4734, 5523, 5823, 9058, 11046, 11646, 13587, 16569, 27174, 33138, 40761, 81522, 170161, 340322, 510483, 1020966, 1191127, 1531449, 2382254, 3062898, 3573381, 7146762, 10720143, 21440286]

約数ペア:

[(1, 21440286), (2, 10720143), (3, 7146762), (6, 3573381), (7, 3062898), (9, 2382254), (14, 1531449), (18, 1191127), (21, 1020966), (42, 510483), (63, 340322), (126, 170161), (263, 81522), (526, 40761), (647, 33138), (789, 27174), (1294, 16569), (1578, 13587), (1841, 11646), (1941, 11046), (2367, 9058), (3682, 5823), (3882, 5523), (4529, 4734)]