21503391

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^2\times {\mathrm{73}}^1\times {\mathrm{83}}^1$

素因数の和:192

約数の個数: 48

約数和(自身を含む): 36400896

約数和(自身を除く): 14897505

約数列:

[1, 3, 7, 13, 21, 39, 73, 83, 91, 169, 219, 249, 273, 507, 511, 581, 949, 1079, 1183, 1533, 1743, 2847, 3237, 3549, 6059, 6643, 7553, 12337, 14027, 18177, 19929, 22659, 37011, 42081, 42413, 78767, 86359, 98189, 127239, 236301, 259077, 294567, 551369, 1023971, 1654107, 3071913, 7167797, 21503391]

約数ペア:

[(1, 21503391), (3, 7167797), (7, 3071913), (13, 1654107), (21, 1023971), (39, 551369), (73, 294567), (83, 259077), (91, 236301), (169, 127239), (219, 98189), (249, 86359), (273, 78767), (507, 42413), (511, 42081), (581, 37011), (949, 22659), (1079, 19929), (1183, 18177), (1533, 14027), (1743, 12337), (2847, 7553), (3237, 6643), (3549, 6059)]