21136455

素因数分解:

$3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{419}}^1$

素因数の和:508

約数の個数: 48

約数和(自身を含む): 39312000

約数和(自身を除く): 18175545

約数列:

[1, 3, 5, 9, 15, 19, 45, 57, 59, 95, 171, 177, 285, 295, 419, 531, 855, 885, 1121, 1257, 2095, 2655, 3363, 3771, 5605, 6285, 7961, 10089, 16815, 18855, 23883, 24721, 39805, 50445, 71649, 74163, 119415, 123605, 222489, 358245, 370815, 469699, 1112445, 1409097, 2348495, 4227291, 7045485, 21136455]

約数ペア:

[(1, 21136455), (3, 7045485), (5, 4227291), (9, 2348495), (15, 1409097), (19, 1112445), (45, 469699), (57, 370815), (59, 358245), (95, 222489), (171, 123605), (177, 119415), (285, 74163), (295, 71649), (419, 50445), (531, 39805), (855, 24721), (885, 23883), (1121, 18855), (1257, 16815), (2095, 10089), (2655, 7961), (3363, 6285), (3771, 5605)]