21215450

素因数分解:

$2^1\times 5^2\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{131}}^1$

素因数の和:263

約数の個数: 48

約数和(自身を含む): 41247360

約数和(自身を除く): 20031910

約数列:

[1, 2, 5, 10, 25, 41, 50, 79, 82, 131, 158, 205, 262, 395, 410, 655, 790, 1025, 1310, 1975, 2050, 3239, 3275, 3950, 5371, 6478, 6550, 10349, 10742, 16195, 20698, 26855, 32390, 51745, 53710, 80975, 103490, 134275, 161950, 258725, 268550, 424309, 517450, 848618, 2121545, 4243090, 10607725, 21215450]

約数ペア:

[(1, 21215450), (2, 10607725), (5, 4243090), (10, 2121545), (25, 848618), (41, 517450), (50, 424309), (79, 268550), (82, 258725), (131, 161950), (158, 134275), (205, 103490), (262, 80975), (395, 53710), (410, 51745), (655, 32390), (790, 26855), (1025, 20698), (1310, 16195), (1975, 10742), (2050, 10349), (3239, 6550), (3275, 6478), (3950, 5371)]