20421895

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{97}}^1$

素因数の和:235

約数の個数: 32

約数和(自身を含む): 27659520

約数和(自身を除く): 7237625

約数列:

[1, 5, 13, 41, 65, 79, 97, 205, 395, 485, 533, 1027, 1261, 2665, 3239, 3977, 5135, 6305, 7663, 16195, 19885, 38315, 42107, 51701, 99619, 210535, 258505, 314183, 498095, 1570915, 4084379, 20421895]

約数ペア:

[(1, 20421895), (5, 4084379), (13, 1570915), (41, 498095), (65, 314183), (79, 258505), (97, 210535), (205, 99619), (395, 51701), (485, 42107), (533, 38315), (1027, 19885), (1261, 16195), (2665, 7663), (3239, 6305), (3977, 5135)]