19998100

素因数分解:

$2^2\times 5^2\times {\mathrm{31}}^1\times {\mathrm{6451}}^1$

素因数の和:6496

約数の個数: 36

約数和(自身を含む): 44802688

約数和(自身を除く): 24804588

約数列:

[1, 2, 4, 5, 10, 20, 25, 31, 50, 62, 100, 124, 155, 310, 620, 775, 1550, 3100, 6451, 12902, 25804, 32255, 64510, 129020, 161275, 199981, 322550, 399962, 645100, 799924, 999905, 1999810, 3999620, 4999525, 9999050, 19998100]

約数ペア:

[(1, 19998100), (2, 9999050), (4, 4999525), (5, 3999620), (10, 1999810), (20, 999905), (25, 799924), (31, 645100), (50, 399962), (62, 322550), (100, 199981), (124, 161275), (155, 129020), (310, 64510), (620, 32255), (775, 25804), (1550, 12902), (3100, 6451)]