21721245

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{15913}}^1$

素因数の和:15941

約数の個数: 32

約数和(自身を含む): 42776832

約数和(自身を除く): 21055587

約数列:

[1, 3, 5, 7, 13, 15, 21, 35, 39, 65, 91, 105, 195, 273, 455, 1365, 15913, 47739, 79565, 111391, 206869, 238695, 334173, 556955, 620607, 1034345, 1448083, 1670865, 3103035, 4344249, 7240415, 21721245]

約数ペア:

[(1, 21721245), (3, 7240415), (5, 4344249), (7, 3103035), (13, 1670865), (15, 1448083), (21, 1034345), (35, 620607), (39, 556955), (65, 334173), (91, 238695), (105, 206869), (195, 111391), (273, 79565), (455, 47739), (1365, 15913)]