19911255

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{503}}^1$

素因数の和:560

約数の個数: 64

約数和(自身を含む): 40642560

約数和(自身を除く): 20731305

約数列:

[1, 3, 5, 7, 13, 15, 21, 29, 35, 39, 65, 87, 91, 105, 145, 195, 203, 273, 377, 435, 455, 503, 609, 1015, 1131, 1365, 1509, 1885, 2515, 2639, 3045, 3521, 5655, 6539, 7545, 7917, 10563, 13195, 14587, 17605, 19617, 32695, 39585, 43761, 45773, 52815, 72935, 98085, 102109, 137319, 189631, 218805, 228865, 306327, 510545, 568893, 686595, 948155, 1327417, 1531635, 2844465, 3982251, 6637085, 19911255]

約数ペア:

[(1, 19911255), (3, 6637085), (5, 3982251), (7, 2844465), (13, 1531635), (15, 1327417), (21, 948155), (29, 686595), (35, 568893), (39, 510545), (65, 306327), (87, 228865), (91, 218805), (105, 189631), (145, 137319), (195, 102109), (203, 98085), (273, 72935), (377, 52815), (435, 45773), (455, 43761), (503, 39585), (609, 32695), (1015, 19617), (1131, 17605), (1365, 14587), (1509, 13195), (1885, 10563), (2515, 7917), (2639, 7545), (3045, 6539), (3521, 5655)]