21212455

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{383}}^1$

素因数の和:471

約数の個数: 32

約数和(自身を含む): 29859840

約数和(自身を除く): 8647385

約数列:

[1, 5, 11, 19, 53, 55, 95, 209, 265, 383, 583, 1007, 1045, 1915, 2915, 4213, 5035, 7277, 11077, 20299, 21065, 36385, 55385, 80047, 101495, 223289, 385681, 400235, 1116445, 1928405, 4242491, 21212455]

約数ペア:

[(1, 21212455), (5, 4242491), (11, 1928405), (19, 1116445), (53, 400235), (55, 385681), (95, 223289), (209, 101495), (265, 80047), (383, 55385), (583, 36385), (1007, 21065), (1045, 20299), (1915, 11077), (2915, 7277), (4213, 5035)]