21156225

素因数分解:

$3^1\times 5^2\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{137}}^1$

素因数の和:250

約数の個数: 48

約数和(自身を含む): 36961920

約数和(自身を除く): 15805695

約数列:

[1, 3, 5, 15, 25, 29, 71, 75, 87, 137, 145, 213, 355, 411, 435, 685, 725, 1065, 1775, 2055, 2059, 2175, 3425, 3973, 5325, 6177, 9727, 10275, 10295, 11919, 19865, 29181, 30885, 48635, 51475, 59595, 99325, 145905, 154425, 243175, 282083, 297975, 729525, 846249, 1410415, 4231245, 7052075, 21156225]

約数ペア:

[(1, 21156225), (3, 7052075), (5, 4231245), (15, 1410415), (25, 846249), (29, 729525), (71, 297975), (75, 282083), (87, 243175), (137, 154425), (145, 145905), (213, 99325), (355, 59595), (411, 51475), (435, 48635), (685, 30885), (725, 29181), (1065, 19865), (1775, 11919), (2055, 10295), (2059, 10275), (2175, 9727), (3425, 6177), (3973, 5325)]