21021125

素因数分解:

$5^3\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{167}}^1$

素因数の和:254

約数の個数: 32

約数和(自身を含む): 28304640

約数和(自身を除く): 7283515

約数列:

[1, 5, 19, 25, 53, 95, 125, 167, 265, 475, 835, 1007, 1325, 2375, 3173, 4175, 5035, 6625, 8851, 15865, 20875, 25175, 44255, 79325, 125875, 168169, 221275, 396625, 840845, 1106375, 4204225, 21021125]

約数ペア:

[(1, 21021125), (5, 4204225), (19, 1106375), (25, 840845), (53, 396625), (95, 221275), (125, 168169), (167, 125875), (265, 79325), (475, 44255), (835, 25175), (1007, 20875), (1325, 15865), (2375, 8851), (3173, 6625), (4175, 5035)]