21106505

素因数分解:

$5^1\times 7^3\times {\mathrm{31}}^1\times {\mathrm{397}}^1$

素因数の和:454

約数の個数: 32

約数和(自身を含む): 30566400

約数和(自身を除く): 9459895

約数列:

[1, 5, 7, 31, 35, 49, 155, 217, 245, 343, 397, 1085, 1519, 1715, 1985, 2779, 7595, 10633, 12307, 13895, 19453, 53165, 61535, 86149, 97265, 136171, 430745, 603043, 680855, 3015215, 4221301, 21106505]

約数ペア:

[(1, 21106505), (5, 4221301), (7, 3015215), (31, 680855), (35, 603043), (49, 430745), (155, 136171), (217, 97265), (245, 86149), (343, 61535), (397, 53165), (1085, 19453), (1519, 13895), (1715, 12307), (1985, 10633), (2779, 7595)]