21990125

素因数分解:

$5^3\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{197}}^1$

素因数の和:278

約数の個数: 32

約数和(自身を含む): 29652480

約数和(自身を除く): 7662355

約数列:

[1, 5, 19, 25, 47, 95, 125, 197, 235, 475, 893, 985, 1175, 2375, 3743, 4465, 4925, 5875, 9259, 18715, 22325, 24625, 46295, 93575, 111625, 175921, 231475, 467875, 879605, 1157375, 4398025, 21990125]

約数ペア:

[(1, 21990125), (5, 4398025), (19, 1157375), (25, 879605), (47, 467875), (95, 231475), (125, 175921), (197, 111625), (235, 93575), (475, 46295), (893, 24625), (985, 22325), (1175, 18715), (2375, 9259), (3743, 5875), (4465, 4925)]